Two-level LED security light with motion sensor

• US 10,326,301 B2
• Filed: 10/17/2017
• Issued: 06/18/2019
• Est. Priority Date: 08/31/2011
• Status: Active Grant

• Current Assignee: Vaxcel International Company Limited
• Original Assignee: Vaxcel International Company Limited
• Inventors: Chen, Chia-Teh
• Primary Examiner(s): Le, Tung X
• Application Number:
  US15/785,658
• Publication Number:
  US 20180042080A1
• Time in Patent Office: 609 Days
• Field of Search: 315149, 315152, 315154, 315307, 315308, 315312
• CPC Class Codes: F21S 9/03 rechargeable by exposure to light
• CPC Class Codes: F21V 17/02 with provision for adjustment F21V17/04 - F21V17/08 take precedence
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G08B 13/00 Burglar, theft or intruder alarms
• CPC Class Codes: G08B 13/189 using passive radiation detection systems
• CPC Class Codes: G08B 13/1895 using light change detection systems G08B13/194 takes precedence
• CPC Class Codes: G08B 15/00 Identifying, scaring or incapacitating burglars, thieves or intruders, e.g. by explosives
• CPC Class Codes: G08B 15/002 with occupancy simulation
• CPC Class Codes: G08B 5/36 using visible light sources
• CPC Class Codes: H02J 7/35 with light sensitive cells
• CPC Class Codes: H05B 39/042 by measuring the incident light
• CPC Class Codes: H05B 39/044 continuously H05B39/042 takes precedence
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/12 using optical feedback
• CPC Class Codes: H05B 45/14 using electrical feedback from LEDs or from LED modules
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/37 Converter circuits
• CPC Class Codes: H05B 45/44 with an active control inside an LED matrix
• CPC Class Codes: H05B 45/46 having LEDs disposed in parallel lines
• CPC Class Codes: H05B 45/48 having LEDs organised in strings and incorporating parallel shunting devices
• CPC Class Codes: H05B 47/10 : Controlling the light source
• CPC Class Codes: H05B 47/105 : in response to determined parameters
• CPC Class Codes: H05B 47/11 : by determining the brightness or colour temperature of ambient light
• CPC Class Codes: H05B 47/115 : by determining the presence or movement of objects or living beings
• CPC Class Codes: H05B 47/16 : by timing means
• CPC Class Codes: H05B 47/17 : Operational modes, e.g. switching from manual to automatic mode or prohibiting specific operations
• CPC Class Codes: Y02B 10/10 : Photovoltaic [PV]
• CPC Class Codes: Y02B 20/40 : Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

A two-level LED security light with a motion sensor. At night, the LED security light is turned on for a low level illumination. When the motion sensor detects any intrusion, the LED security light is switched from the low level illumination to a high level illumination for a short duration time and then returns to the low level illumination for saving energy. The LED security light includes a power supply unit, a light sensing control unit, a motion sensing unit, a loading and power control unit, and a lighting-emitting unit and at least one external control unit electrically coupled to a controller of the loading and power control unit to receive and convert at least an external control signal into a message signal interpretable by the controller for adjusting at least an operating parameter or changing at least an illumination mode of the two-level LED security light.

Claims

1. A two-level LED security light comprising:

a light-emitting unit;

a loading and power control unit;

a light sensing control unit;

a motion sensing unit;

a power supply unit; and

at least one external control unit;

wherein the light-emitting unit comprises a plurality of LEDs divided into two sets of LEDs with a first set of the light-emitting unit having N number LEDs and a second set of the light-emitting unit having M number LEDs, wherein N and M are positive integers;

wherein the loading and power control unit comprises a controller and at least two switching devices including at least one first switching device and at least one second switching device, wherein the controller is electrically coupled to the light sensing control unit, the motion sensing unit and the at least two switching devices;

wherein the at least one first switching device and the at least one second switching device are respectively and electrically coupled with the first set of the light-emitting unit and the second set of the light-emitting unit, wherein the at least one first switching device and the at least one second switching device are controlled by the controller to be conducting or cut-off to perform at least a first switching mode and a second switching mode respectively;

wherein in the first switching mode the controller outputs at least a first control signal to turn on the first set of the light-emitting unit to perform a low level illumination mode characterized by a first light intensity and in the second switching mode the controller outputs at least a second control signal to turn on the second set of the light-emitting unit to perform a high level illumination mode characterized by a second light intensity, wherein the second light intensity is higher than the first light intensity;

wherein when an ambient light detected by the light sensing control unit is lower than a first predetermined value, the loading and power control unit manages to operate the first switching mode to turn on the first set of the light-emitting unit for performing the low level illumination mode with the first light intensity;

wherein when the ambient light detected by the light sensing control unit is higher than a second predetermined value, the loading and power control unit manages to turn off all the LEDs in the light-emitting unit;

wherein when a motion signal is detected by the motion sensing unit, the loading and power control unit manages to operate at least the second switching mode to turn on the second set of the light-emitting unit to perform a high level illumination mode with a second light intensity for a predetermined time duration before resuming to the low level illumination mode with the first light intensity; and

wherein the at least one external control unit is electrically coupled to the controller for adjusting at least one of the first light intensity, the second light intensity or the predetermined duration, or for switching at least from one performance mode to a different performance mode characterized with different light intensities.

2. The two-level LED security light according to claim 1, wherein when the second set of the light-emitting unit is turned on upon detecting the motion intrusion, the loading and power control unit continues to turn on the first set of the light-emitting unit.

3. The two-level LED security light according to claim 1, wherein when the second set of the light-emitting unit is turned on upon detecting the motion intrusion the loading and power control unit manages to turn off the first set of the light-emitting unit.

4. The two-level LED security light according to claim 1, wherein the power supply unit outputs at least one DC power for operating the two-level LED security light, wherein the first set of the light-emitting unit and the second set of the light-emitting unit are connected in series, wherein the first switching device is electrically connected in parallel with the second set of the light-emitting unit, wherein the second switching device is electrically connected in parallel with the first set of the light-emitting unit;

wherein a control circuit is configured in the power supply unit to control a constant electric current passing through LEDs such that an electric current level for driving the LEDs remains stable in light of a drastic change of lighting load between driving the N number LEDs for generating the low level illumination and driving at least the M number LEDs for generating the high level illumination.

5. The two-level LED security light according to claim 4, wherein when the light-emitting unit is in the low level illumination mode with the N number LEDs in a conduction state, the first light intensity is further adjustable by the controller;

wherein the first set of the light-emitting unit is configured to include a plurality of switching devices coupled to the two ends associated with each LED and to the controller, wherein the controller is configured to control the number of LEDs to be turned on in the N number LEDs through bypassing unwanted LEDs in the N number LEDs with the associated switching device(s) according to an external control signal received from the external control unit; and

wherein the external control unit is a push button device, a voltage divider or a wireless remote control receiver.

6. The two-level LED security light according to claim 4, wherein the loading and power control unit further comprises a third switching device controlled by the controller and electrically coupled in series with the light-emitting unit and the power supply unit for controlling a conduction or a cutoff of the light-emitting unit, wherein when the light-emitting unit is in the low level illumination mode with the first set of the light-emitting unit in a conduction state, the first light intensity is further adjustable by the controller;

wherein the controller in response to an external control signal received from the external control unit outputs a PWM signal to control a time length of conduction period of the third switching device in each duty cycle of the PWM signal such that an average electric power proportional to the time length of conduction period is delivered to the light-emitting unit for performing a dimming work of the low level illumination; and

wherein the external control unit is a push button device, a voltage divider or a wireless remote control receiver.

7. The two-level LED security light according to claim 4, wherein when the light-emitting unit is in the high level illumination mode, the second light intensity is further adjustable by the controller, wherein the second set of the light-emitting unit is configured to include a plurality of switching devices coupled to the two ends associated with each LED and to the controller, wherein the controller is configured to control the number of LEDs to be turned on in the M number LEDs through bypassing unwanted LEDs in the M number LEDs with the associated switching device(s) according to an external control signal received from the external control unit;

and wherein the external control unit is a push button device, a voltage divider or a wireless remote control receiver.

8. The two-level LED security light according to claim 4, wherein the loading and power control unit further comprises a third switching device controlled by the controller and electrically coupled in series with the light-emitting unit and the power supply unit for controlling a conduction or a cutoff of the light-emitting unit, wherein when the light-emitting unit is in the high level illumination mode, the second light intensity is further adjustable by the controller;

wherein the controller in response to an external control signal received from the external control unit outputs a PWM signal to control a time length of conduction period of the third switching device in each duty cycle of the PWM signal such that an average electric power proportional to the time length of conduction period is delivered to the light-emitting unit for performing a dimming work of the high level illumination; and

wherein the external control unit is a push button device, a voltage divider or a wireless remote control receiver.

9. The two-level LED security light according to claim 1, wherein the power supply unit outputs at least one DC power for operating the two-level LED security light, wherein the first set of the light-emitting unit and the second set of the light-emitting unit are electrically connected in series;

wherein the first switching device is electrically connected in parallel with the second set of the light-emitting unit and the second switching device is electrically connected between the power supply unit and the light-emitting unit;

wherein when the first switching mode is performed, the first switching device is conducted for bypassing the second set of the light-emitting unit and the second switching device is conducted for turning on the light-emitting unit for generating the low level illumination;

wherein when the second switching mode is performed, the first switching device is cutoff and the second switching device is conducted for turning on the light-emitting unit for generating the high level illumination;

wherein a control circuit is configured in the power supply unit to control a constant electric current passing through LEDs such that an electric current level for driving the LEDs remains stable in light of a drastic change of lighting load between driving the N number LEDs for generating the low level illumination and driving at least the M number LEDs for generating the high level illumination.

10. The two level LED security light according to claim 9, wherein when the first switching mode is performed, the first light intensity of the low level illumination mode is further adjustable by the controller, wherein the controller in response to an external control signal received from the external control unit outputs a PWM signal to control a time length of conduction period of the second switching device in each duty cycle of the PWM signal such that an average electric power proportional to the time length of conduction period is delivered to the light-emitting unit for performing a dimming work of the low level illumination mode;

and wherein the external control unit is a push button device, a voltage divider or a wireless remote control receiver.

11. The two level LED security light according to claim 9, wherein. when the second switching mode is performed, the second light intensity of the high level illumination mode is further adjustable by the controller, wherein the controller in response to an external control signal received from the external control unit outputs a PWM signal to control a time length of conduction period of the second switching device in each duty cycle of the PWM signal such that an average electric power proportional to the time length of conduction period is delivered to the light-emitting unit for performing a dimming work of the high level illumination;

and wherein the external control unit is a push button device, a voltage divider or a wireless remote control receiver.

12. The two-level LED security light according to claim 1, wherein the power supply unit outputs at least one DC power for operating the two-level LED security light;

wherein the first set of the light-emitting unit and the second set of the light-emitting unit are connected in parallel, wherein the first switching device is electrically connected in series between the first set of the light-emitting unit and the power supply unit, wherein the second switching device is electrically connected in series between the second set of the light-emitting unit and the power supply unit;

wherein the N number LEDs of the first set of the light-emitting unit and the M number LEDs of the second set of the light-emitting unit are respectively designed with a configuration of in series and/or in parallel connections such that when incorporated with an adequate level setting of the at least one DC power, an electric current passing through each LED of the M number LEDs and each LED of the N number LEDs remains at an adequate level such that a voltage V across each LED complies with an operating constraint of V_th<

V<

V_max featuring electrical characteristics of a LED, where V_th is a threshold voltage required to trigger the LED to start emitting light and V_max is a maximum operating voltage across each LED to avoid an effect of a thermal runaway which results in burning out the LED or damaging an LED construction resulting in a shortened LED lifetime.

13. The two-level LED security light according to claim 12, wherein when the first set of the light-emitting unit is in a conduction state, the first light intensity is further adjustable by the controller;

wherein the first set of the light-emitting unit is configured to include a plurality of switching devices coupled to the two ends associated with each LED and to the controller, wherein the controller is configured to control the number of LEDs to be turned on in the N number LEDs through bypassing unwanted LEDs in the N number LEDs with the associated switching device(s) according to an external control signal received from the external control unit; and

wherein the external control unit is a push button device, a voltage divider or a wireless remote control receiver.

14. The two-level LED security light according to claim 12, wherein when the first set of the light-emitting unit is in a conduction state, the first light intensity of the light emitting unit is further adjustable by the controller;

wherein the controller in response to an external control signal received from the external control unit outputs a PWM signal to control a time length of conduction period of the first switching device in each duty cycle of the PWM signal such that an average electric power proportional to the time length of conduction period is delivered to the first set of the light-emitting unit for performing a dimming work of the low level illumination mode.

15. The two-level LED security light according to claim 12, wherein when the second set of the light-emitting unit is in a conduction state, the second light intensity is further adjustable by the controller, wherein the second set of the light-emitting unit is configured to include a plurality of switching devices coupled to the two ends associated with each LED and to the controller, wherein the controller is configured to control the number of LEDs to be turned on in the M number LEDs through bypassing unwanted LEDs in the M number LEDs with the associated switching device(s) according to an external control signal received from the external control unit;

and wherein the external control unit is a push button device, a voltage divider or a wireless remote control receiver.

16. The two-level LED security light according to claim 12, wherein when the second set of the light-emitting unit is in a conduction state, the second light intensity of the light-emitting unit is further adjustable by the controller;

wherein the controller in response to an external control signal received from the external control unit outputs a PWM signal to control a time length of conduction period of the second switching device in each duty cycle of the PWM signal such that an average electric power proportional to the time length of conduction period is delivered to the second set of the light-emitting unit for performing a dimming work of the high level illumination mode.

17. The two-level LED security light according to claim 1, wherein the external control unit is a power interruption detection circuitry electrically coupled to the controller for detecting a short power interruption signal;

wherein when the short power interruption signal is detected, the controller operates to alternately perform one of the high level illumination mode and the motion sensing illumination mode, wherein in the high level illumination mode the motion sensing unit is temporarily deactivated, and wherein in the motion sensing illumination mode the motion sensing unit is activated.

18. The two level LED security light according to claim 1, wherein the external control unit is a power interruption detection circuitry electrically coupled to the controller for detecting a short power interruption signal;

wherein when the short power interruption signal is detected, the controller operates to alternately perform one of the low level illumination mode and the motion sensing illumination mode, wherein in the low level illumination mode the motion sensing unit is temporarily deactivated, and wherein in the motion sensing illumination mode the motion sensing unit is activated.

19. The two level LED security light according to claim 1, wherein the external control unit is a power interruption detection circuitry electrically coupled to the controller for detecting a short power interruption signal;

wherein when the short power interruption signal is detected, the controller operates to alternately perform one of the low level illumination mode, the high level illumination mode and the motion sensing illumination mode according to a sequence of the short power interruption signals received, wherein in the low level illumination mode or the high level illumination mode the motion sensing unit is temporarily deactivated, and wherein in the motion sensing illumination mode the motion sensing unit is activated.

20. A two-level LED security light comprising:

a light-emitting unit;

a loading and power control unit;

a light sensing control unit;

a motion sensing unit;

a power supply unit; and

at least one external control unit;

wherein the light-emitting unit comprises a plurality of LEDs divided into two sets of LEDs with a first set of the light-emitting unit having N number LEDs and a second set of the light-emitting unit having M number LEDs;

wherein the N number LEDs are of a low color temperature to produce a soft light while the M number LEDs are of a high color temperature to produce a bright light, wherein N and M are positive integers;

wherein the loading and power control unit comprises a controller electrically coupled to the light sensing control unit, the motion sensing unit and at least two switching devices including at least one first switching device and at least one second switching device;

wherein the at least one first switching device and the at least one second switching device are respectively and electrically coupled with the first set of the light-emitting unit and the second set of the light-emitting unit;

wherein the two switching devices are controlled by the controller to be respectively conducting or cut-off to perform at least respectively a first switching mode and a second switching mode;

wherein in the first switching mode at least the first set of the light-emitting unit is switched on and in the second switching mode at least the second set of the light-emitting unit is switched on;

wherein when an ambient light detected by the light sensing control unit is lower than a first predetermined value, the loading and power control unit manages to activate at least the first switching mode to perform a first illumination mode emitting light characterized by a first light intensity and a low color temperature;

wherein when the ambient light detected by the light sensing control unit is higher than a second predetermined value, the loading and power control unit manages to turn off all the LEDs in the light-emitting unit;

wherein when a motion signal is detected by the motion sensing unit, the loading and power control unit manages to activate at least the second switching mode to perform a second illumination mode emitting light characterized by a second light intensity and a high color temperature for a predetermined duration, wherein the second light intensity is higher than the first light intensity; and

wherein the external control unit is electrically coupled to the controller for adjusting at least one operating parameter of the first light intensity, the second light intensity, the low color temperature, or the high color temperature, or for switching from one performance mode to another performance mode characterized by a different lighting intensity and/or a different color temperature.

21. The two-level LED security light according to claim 20, wherein when the second set of the light-emitting unit is turned on upon detecting the motion signal, the loading and power control unit continues to turn on the first set of the light-emitting unit to perform the second illumination mode.

22. The two-level LED security light according to claim 20, wherein when the second set of the light-emitting unit is turned on upon detecting the motion signal, the loading and power control unit manages to turn off the first set of the light-emitting unit to perform the second illumination mode.

23. The two-level LED security light according to claim 20, wherein the power supply unit outputs at least one DC power for operating the two-level LED security light, wherein the first set of the light-emitting unit and the second set of the light-emitting unit are connected in series, wherein the first switching device is electrically connected in parallel with the second set of the light-emitting unit and the second switching device is electrically connected in parallel with the first set of the light-emitting unit, wherein a control circuit is configured in the power supply unit to control a constant electric current passing through LEDs such that an electric current level for driving the LEDs remains stable in light of a drastic change of lighting load between driving the N number LEDs and driving at least the M number LEDs respectively for performing the first illumination mode and the second illumination mode.

24. The two-level LED security light according to claim 23, wherein when the light-emitting unit is in the first illumination mode, the first light intensity is further adjustable by the controller;

wherein the first set of the light-emitting unit is configured to include a plurality of switching devices coupled to the two ends associated with each LED and to the controller, wherein the controller is configured to control the number of LEDs to be turned on in the N number LEDs through bypassing unwanted LEDs in the N number LEDs with the associated switching device(s) according to an external control signal played by a user or according to a value of a voltage divider set by the user.

25. The two-level LED security light according to claim 23, wherein the loading and power control unit further comprises a third switching device controlled by the controller and electrically coupled in series with the light-emitting unit and the power supply unit for controlling a conduction or a cutoff of the light-emitting unit, wherein when the light-emitting unit is in the first illumination mode, the first light intensity is further adjustable by the controller;

wherein the controller in response to an external control signal played by a user outputs a PWM signal to control a time length of conduction period of the third switching device in each duty cycle of the PWM signal such that an average electric power proportional to the time length of conduction period is delivered to the first set of the light-emitting unit for performing a dimming work of the first illumination mode.

26. The two-level LED security light according to claim 23, wherein when the light-emitting unit is in the second illumination mode, the second light intensity is further adjustable by the controller, wherein the second set of the light-emitting unit is configured to include a plurality of switching devices coupled to the two ends associated with each LED and to the controller, wherein the controller is configured to control the number of LEDs to be turned on in the M number LEDs through bypassing unwanted LEDs in the M number LEDs with the associated switching device(s) according to an external control signal played by a user or according to a value of a voltage divider set by the user.

27. The two-level LED security light according to claim 23, wherein the loading and power control unit further comprises a third switching device controlled by the controller and electrically coupled in series with the light-emitting unit and the power supply unit for controlling a conduction or a cutoff of the light-emitting unit, wherein when the light-emitting unit is in the second illumination mode, the second light intensity is further adjustable by the controller;

wherein the controller in response to an external control signal played by a user outputs a PWM signal to control a time length of conduction period of the third switching device in each duty cycle of the PWM signal such that an average electric power proportional to the time length of conduction period is delivered to the light emitting unit for performing a dimming work of the second illumination mode.

28. The two-level LED security light according to claim 20, wherein the power supply unit outputs at least one DC power for operating the two-level LED security light, wherein the first set of the light-emitting unit and the second set of the light-emitting unit are electrically connected in series;

wherein the first switching device is electrically connected in parallel with the second set of the light-emitting unit and the second switching device is electrically connected between the power supply unit and the light-emitting unit;

wherein when the first switching mode is performed, the first switching device is conducted for bypassing the second set of the light-emitting unit and the second switching device is conducted for turning on the light-emitting unit for performing the first illumination mode;

wherein when the second switching mode is performed, the first switching device is cutoff and the second switching device is conducted for turning on the light-emitting unit for performing the second illumination mode;

wherein a control circuit is configured in the power supply unit to control a constant electric current passing through LEDs such that an electric current level for driving the LEDs remains stable in light of a drastic change of lighting load between driving the N number LEDs for performing the first illumination mode and driving at least the M number LEDs for performing the second illumination mode.

29. The two-level LED security light according to claim 28, wherein when the first switching mode is performed, the first light intensity of the first illumination mode is further adjustable by the controller, wherein the controller in response to an external control signal received from the external control unit outputs a PWM signal to control a time length of conduction period of the second switching device in each duty cycle of the PWM signal such that an average electric power proportional to the time length of conduction period is delivered to the light-emitting unit for performing a dimming work of the first illumination mode;

and wherein the external control unit is a push button device, a voltage divider or a wireless remote control receiver.

30. The two-level LED security light according to claim 28, wherein when the second switching mode is performed, the second light intensity of the second illumination mode is further adjustable by the controller, wherein the controller in response to an external control signal received from the external control unit outputs a PWM signal to control a time length of conduction period of the second switching device in each duty cycle of the PWM signal such that an average electric power proportional to the time length of conduction period is delivered to the light-emitting unit for performing a dimming work of the second illumination mode;

and wherein the external control unit is a push button device, a voltage divider or a wireless remote control receiver.

31. The two-level LED security light according to claim 20, wherein the power supply unit outputs at least one DC power for operating the two-level security light;

wherein the first set of the light-emitting unit and the second set of the light-emitting unit are connected in parallel, wherein the first switching device is electrically connected in series between the first set of the light-emitting unit and the power supply unit, wherein the second switching device is electrically connected in series between the second set of the light-emitting unit and the power supply unit;

wherein when the first illumination mode is performed, the controller outputs a control signal to control a conduction rate of the first switching device to deliver an electric power to at least the first set of the light-emitting unit for performing the first illumination mode;

wherein when the second illumination mode is performed, the controller outputs at least one control signal to control at least a conduction rate of the second switching device to deliver an electric power to the second set of the light-emitting unit for performing the second illumination mode;

wherein the N number LEDs of the first set of the light-emitting unit and the M number LEDs of the second set of the light-emitting unit are respectively designed with an adequate configuration of in series and/or in parallel connections such that when incorporated with an adequate level of the at least one DC power an electric current passing through each LED of the M number LEDs and each LED of the N number LEDs remains at an adequate level such that a voltage V across each LED complies with an operating constraint of V_th<

V<

V_max featuring electrical characteristics of a LED, wherein V_th is a threshold voltage required to trigger the LED to start emitting light and V_max is a maximum operating voltage across each LED to avoid an effect of a thermal runaway which results in burning out the LED or damaging an LED construction resulting in a shortened LED lifetime.

32. The two-level LED security light according to claim 31, wherein when the light-emitting unit is in the first illumination mode with the first set of the light-emitting unit being in a conduction state, the first light intensity of the first illumination mode is further adjustable by the external control unit;

wherein when the controller receives an external control signal from the external control unit, the controller operates to output a PWM signal to adjust the time length of conduction period of the first switching device in each duty cycle of the PWM signal such that an average electric current proportional to the time length of conduction period is delivered to the first set of the light-emitting unit for performing a dimming work of the first illumination mode.

33. The two-level LED security light according to claim 31, wherein when the light emitting unit is in the second illumination mode with at least the second set of the light-emitting unit being in a conduction state, the second light intensity of the second illumination mode is further adjustable by the external control unit;

wherein when the controller receives an external control signal from the external control unit, the controller outputs a PWM signal to control a time length of conduction period of the second switching device in each duty cycle of the PWM signal such that an average electric power proportional to the time length of conduction period is delivered to the second set of the light-emitting unit for performing a dimming work of the second illumination mode.

34. The two-level LED security light according to claim 31, wherein when the light-emitting unit is in the second illumination mode, a light intensity of the first set of the light-emitting unit and a light intensity of the second set of the light-emitting unit are respectively adjustable to tune a mingled color temperature thru a light diffuser;

wherein upon receiving an external control signal from the external control unit the controller operates to simultaneously but reversely adjust the light intensity of the first set of the light-emitting unit and the light intensity of the second set of the light-emitting unit;

wherein for changing to a lower mingled color temperature, the controller upon receiving a first related external control signal operates to increase the conduction rate of the first switching device to increase the electric power delivered to the first set of the light-emitting unit and at the same time operates to proportionally decrease the conduction rate of the second switching device to decrease the electric power delivered to the second set of the light-emitting unit;

wherein for changing to a higher mingled color temperature, the controller upon receiving a second related external control signal operates to decrease the conduction rate of the first switching device to decrease the electric power delivered to the first set of the light-emitting unit and at the same time operates to proportionally increase the conduction rate of the second switching device to increase the electric power delivered to the second set of the light-emitting unit.

35. The two-level LED security light according to claim 34, wherein the controller is programmed with a color temperature tuning scheme, wherein paired combinations of different light intensities between operating the first set of the light-emitting unit and operating the second set of the light-emitting unit for creating different mingled color temperatures are preprogrammed and stored in a memory unit addressable by the controller for selection according to the external control signal received and interpreted by the controller for performing selected mingled color temperature.

36. The two-level LED security light according to claim 35, wherein the external control unit is a power interruption detection circuitry electrically coupled to the controller for detecting a short power interruption signal;

wherein when the short power interruption signal is detected, the controller operates to alternately switch a selection of different color temperatures according to the color temperature tuning scheme preprogrammed.

37. The two level LED security light according to claim 35, wherein the external control unit is a voltage divider and the external control signal is a voltage output of the voltage divider set by a user for selecting a color temperature performance of the color temperature tuning scheme.

38. The two-level LED security light according to claim 34, wherein the external control unit is a voltage divider and the external control signal is a voltage output of the voltage divider set by a user.

39. The two-level LED security light according to claim 34, wherein the external control unit is a push button and the external control signal is a voltage signal with a time length corresponding to a time duration of the push button being operated by an user.

40. The two-level LED security light according to claim 34, wherein the external control unit is a wireless remote control receiver and the external control signal is an RF signal transmitted from a wireless mobile device.

41. The two-level LED security light according to claim 34, wherein in tuning the mingled color temperature the controller operates to simultaneously but reversely adjust the light intensity of the first set of the light-emitting unit and the light intensity of the second set of the light-emitting unit with an arrangement that a total wattage performance of the light emitting unit is kept unchanged during adjusting process.

42. The two level LED security light according to claim 20, wherein the external control unit is a power interruption detection circuitry electrically coupled to the controller for detecting a short power interruption signal;

wherein when the short power interruption signal is detected, the controller operates to alternately perform one of the first illumination mode and the second illumination mode, wherein in the first illumination mode the motion sensing unit is temporarily deactivated, and wherein in the second illumination mode the motion sensing unit is activated.

43. A two-level LED security light comprising:

a light-emitting unit;

a loading and power control unit;

a light sensing control unit;

a power supply unit; and

at least one external control unit;

wherein the light-emitting unit comprises a plurality of LEDs divided into two sets of LEDs with a first set of the light-emitting unit having N number LEDs and a second set of the light-emitting unit having M number LEDs, wherein N and M are positive integers;

wherein the N number LEDs are of a low color temperature while the M number LEDs are of a high color temperature;

wherein the loading and power control unit comprises a controller and a switching circuitry, wherein the controller is electrically coupled to the light sensing control unit, the switching circuitry and the at least one external control unit;

wherein the switching circuitry is electrically coupled between at least one power source of the power supply unit and the first set of the light-emitting unit and the second set of the light-emitting unit;

wherein the switching circuitry is controlled by the controller to perform at least respectively a first switching mode and a second switching mode according to signals respectively received from the light sensing control unit, and the at least one external control unit;

wherein in the first switching mode at least the first set of the light-emitting unit is turned on to perform a first illumination mode and in the second switching mode at least the second set of the light-emitting unit is turned on to perform a second illumination mode;

wherein when an ambient light detected by the light sensing control unit is lower than a first predetermined value, the loading and power control unit manages to perform at least one of the first switching mode and the second switching mode for performing at least one of the first illumination mode and the second illumination mode;

wherein when the ambient light detected by the light sensing control unit is higher than a second predetermined value, the loading and power control unit manages to turn off all the LEDs in the light-emitting unit;

wherein the at least one external control unit is electrically coupled to the controller for adjusting at least one operating parameter of a light intensity of the first illumination mode, a light intensity of the second illumination mode, a color temperature of the first illumination mode or a color temperature of the second illumination mode, or for switching from the first illumination mode to the second illumination mode; and

wherein the N number LEDs of the first set of the light-emitting unit and the M number LEDs of the second set of the light-emitting unit are respectively designed with a configuration of in series and/or in parallel connections such that when incorporated with an adequate setting of the at least one power source an electric current passing through each LED of the M number LEDs and each LED of the N number LEDs remains at an adequate level such that a voltage V across each LED complies with an operating constraint of V_th<

V<

V_max featuring electrical characteristics of a LED, where V_th is a threshold voltage required to trigger the LED to start emitting light and V_max is a maximum operating voltage across each LED to avoid an effect of a thermal runaway which results in burning out the LED or damaging an LED construction resulting in a shortened LED lifetime.

44. The two-level LED security light according to claim 43, wherein the external control unit is a power interruption detection circuitry electrically coupled to the controller for detecting a short power interruption signal;

wherein when the short power interruption signal is detected, the controller operates to alternately perform one of the first illumination mode and the second illumination mode;

wherein the first illumination mode is a low level illumination mode with the low color temperature and the second illumination mode is a high level illumination mode with the high color temperature.

45. The two-level LED security light according to claim 43, wherein the external control unit is a power interruption detection circuitry electrically coupled to the controller for detecting a short power interruption signal;

wherein when the short power interruption signal is detected, the controller operates to alternately perform at least one of a first illumination mode, a second illumination mode and a third illumination mode;

wherein when the first illumination mode is performed, the loading and power control unit manages to turn on only the first set of the light-emitting unit, wherein when the second illumination mode is performed, the loading and power control unit manages to turn on only the second set of the light-emitting unit, wherein when the third illumination mode is performed, the loading and power control unit manages to turn on the first set of the light-emitting unit with a reduced illumination by decreasing an electric power delivered to the first set of the light-emitting unit.

46. The two level LED security light according to claim 43, wherein the external control unit is a power interruption detection circuitry electrically coupled to the controller for detecting a short power interruption signal;

wherein when the short power interruption signal is detected, the controller operates to alternately perform at least one of a first illumination mode, a second illumination mode and a third illumination mode;

wherein when the first illumination mode is performed, the loading and power control unit manages to turn on only the first set of the light-emitting unit to perform the low level illumination mode emitting light with the low color temperature, wherein when the second illumination mode is performed, the loading and power control unit manages to turn on only the second set of the light-emitting unit to perform the high level illumination mode emitting light with the high color temperature;

wherein when the third illumination mode is performed, the loading and power control unit manages to turn on both the first set of the light-emitting unit and the second set of the light-emitting unit respectively at reduced illumination levels such that the light-emitting unit accordingly performs a medium mingled color temperature.

47. The two level LED security light according to claim 43, wherein the external control switch is a slide switch for selecting one performance of the first illumination mode or the second illumination mode.

48. A two-level LED security light comprising:

a light-emitting unit having a plurality of LEDs configured with a first LED lighting load for emitting light with a low color temperature, a second LED lighting load for emitting light with a high color temperature and a diffuser covering the first LED lighting load and the second LED lighting load to create a diffused light with a mingled color temperature;

a loading and power control unit;

a light sensing control unit;

a motion sensing unit;

a power supply unit; and

at least one external control unit;

wherein the loading and power control unit comprises a controller and a switching circuitry, wherein the controller is electrically and respectively coupled with the light sensing control unit, the motion sensing unit , the switching circuitry and the at least one external control unit;

wherein the switching circuitry is electrically coupled between a power source of the power supply unit and the light-emitting unit, wherein the power source is a DC power source configured in the power supply unit;

wherein the switching circuitry comprises at least one unidirectional semiconductor switching device;

wherein the first LED lighting load and the second LED lighting load are connected in parallel and are further respectively and electrically coupled to the switching circuitry;

wherein the controller outputs control signals to control different conduction rates of the switching circuitry for delivering different average electric powers from the power source respectively to the first LED lighting load and the second LED lighting load of the light emitting unit such that the light-emitting unit respectively generates illuminations of different light intensities and different mingled color temperatures for performing different illumination modes according to signals respectively received from the light sensing control unit, the motion sensing unit and the at least one external control unit;

wherein when an ambient light detected by the light sensing control unit is lower than a first predetermined value, at least the first LED lighting load being controlled by the light sensing control unit is switched on;

wherein the controller outputs at least a first control signal to control at least a first conduction rate of the switching circuitry such that a low electric power is delivered to the light emitting unit to perform a low level illumination mode emitting light with a low light intensity and a low mingled color temperature;

wherein when the ambient light detected by the light sensing control unit is higher than a second predetermined value, the light-emitting unit including the first LED lighting load and the second LED lighting load being controlled by the light sensing control unit is switched off;

wherein when a motion signal is detected by the motion sensing unit, at least the second LED lighting load is switched on by the loading and power control unit, wherein the controller outputs at least a second control signal to control at least a second conduction rate of the switching circuitry such that a high electric power is delivered to the light emitting unit to perform a high level illumination mode emitting light with a high light intensity and a high mingled color temperature for a predetermined time duration before switching back to the low level illumination mode;

wherein the at least one external control unit generates at least one external control signal for adjusting or selecting at least one operating parameter including the light intensity of the low level illumination mode, the mingled color temperature of the low level illumination mode, the light intensity of the high level illumination mode, the mingled color temperature of the high level illumination mode and a time length of the predetermined time duration;

wherein the LEDs of the first LED lighting load and the LEDs of the second LED lighting load are respectively designed with a configuration of in series and/or in parallel connections such that when incorporated with an adequate setting of the power source an electric current passing through each LED of the first LED lighting load and each LED of the second LED lighting load remains at an adequate level such that a voltage V across each LED complies with an operating constraint of V_th<

V<

V_max featuring electrical characteristics of a LED, where V_th is a threshold voltage required to trigger the LED to start emitting light and V_max is a maximum operating voltage across each LED to avoid an effect of a thermal runaway which results in burning out the LED or damaging an LED construction resulting in a shortened LED lifetime.

49. The two-level LED security light according to claim 48, wherein when the light emitting unit is in the high level illumination mode, the light intensity of the first LED lighting load and the light intensity of the second LED lighting load are respectively adjustable to tune the mingled color temperature of the diffused light created through the light diffuser;

wherein upon receiving the external control signal from the at least one external control unit the controller operates in response to simultaneously but reversely adjust the light intensity of the first LED lighting load and the light intensity of the second LED lighting load with the same pace;

wherein for changing to a lower mingled color temperature, the controller upon receiving the external control signal operates to control the switching circuitry to increase an electric power delivered to the first LED lighting load and at the same time proportionally decrease the electric power delivered to the second LED lighting load;

wherein for changing to a higher mingled color temperature, the controller upon receiving the external control signal operates to control the switching circuitry to decrease the electric power delivered to the first LED lighting load and at the same time proportionally increase the electric power delivered to the second LED lighting load.

50. The two-level LED security light according to claim 49, wherein the controller is programmed with a color temperature tuning scheme, wherein paired combinations of different light intensities between operating the first LED lighting load and operating the second LED lighting load for creating different mingled color temperatures are preprogrammed and stored in a memory unit addressable by the controller for operating a pick and play process according to the external control signal received and interpreted by the controller for performing a selected mingled color temperature.

51. The two-level LED security light according to claim 49, wherein in tuning the mingled color temperature the controller operates to simultaneously but reversely adjust the light intensity of the first LED lighting load and the light intensity of the second LED lighting load with an arrangement that a total wattage performance of the light emitting unit is kept unchanged during adjusting process.

52. The two-level LED security light according to claim 48 wherein the at least one external control unit includes at least one voltage divider and the external control signal is a voltage output of the voltage divider set by a user.

53. The two-level LED security light according to claim 48, wherein the at least one external control unit includes at least one push button or one touch pad and the external control signal is a voltage signal with a time length corresponding to a time duration of the push button or the touch pad being operated by a user.

54. The two-level LED security light according to claim 48, wherein the at least one external control unit is a wireless remote control receiver and the external control signal is a wireless signal transmitted from a mobile device.

55. The two-level LED security light according to claim 48, wherein when the light-emitting unit is in the low level illumination mode, the light intensity of the first LED lighting load and the light intensity of the second LED lighting load are respectively adjustable to tune the mingled color temperature thru the light diffuser;

wherein upon receiving the external control signal from the external control unit the controller operates to simultaneously but reversely adjust the light intensity of the first LED lighting load and the light intensity of the second LED lighting load;

wherein for changing to a lower mingled color temperature, the controller upon receiving the external control signal operates to control the switching circuitry to increase the electric power delivered to the first LED lighting load and at the same time proportionally decrease the electric power delivered to the second LED lighting load;

wherein for changing to a higher mingled color temperature, the controller upon receiving the external control signal operates to control the switching circuitry to decrease the electric power delivered to the first LED lighting load and at the same time proportionally increase the electric power delivered to the second LED lighting load.

56. The two-level LED security light according to claim 55, wherein the controller is programmed with a color temperature tuning scheme, wherein paired combinations of different light intensities between operating the first LED lighting load and operating the second LED lighting load for creating different mingled color temperatures are preprogrammed and stored in a memory unit addressable by the controller for operating a pick and play process according to the external control signal received and interpreted by the controller for performing a selected mingled color temperature.

57. A lifestyle LED security light comprising:

a light-emitting unit, configured with a first LED lighting load for emitting light with a low color temperature, a second LED lighting load for emitting light with a high color temperature and a diffuser covering the first LED lighting load and the second LED lighting load to create a diffused light with a mingled color temperature;

a loading and power control unit;

a light sensing control unit;

a motion sensing unit;

a power supply unit; and

at least one external control unit;

wherein the loading and power control unit comprises a controller and a switching circuitry, wherein the controller is electrically and respectively coupled with the light sensing control unit, the motion sensing unit, the switching circuitry and the at least one external control unit ;

wherein the switching circuitry comprises at least a first semiconductor switching device and a second semiconductor switching device;

wherein the first LED lighting load and the second LED lighting load are connected in parallel and are further respectively and electrically coupled to the first semiconductor switching device and the second semiconductor switching device;

wherein the controller outputs a first control signal to control a first conduction rate of the first semiconductor switching device for delivering a first electric power to the first LED lighting load and simultaneously a second control signal to control a second conduction rate of the second semiconductor switching device for delivering a second electric power to the second LED lighting load such that the light-emitting unit respectively generates illuminations of different light intensities and different mingled color temperatures for performing different illumination modes according to signals respectively received from the light sensing control unit, the motion sensing unit and the at least one external control unit;

wherein when an ambient light detected by the light sensing control unit is lower than a first predetermined value, the light-emitting unit being controlled by the light sensing control unit is switched on to perform a first illumination mode with the motion sensing unit being temporarily deactivated;

wherein the controller outputs at least the first control signal to control at least the first conduction rate of at least the first semiconductor switching device such that a total electric power is delivered to the light-emitting unit to perform the first illumination mode with a first level illumination characterized with a first light intensity and a first mingled color temperature for a first predetermined time duration;

wherein upon a maturity of the first predetermined time duration the loading and power control unit manages to cutoff the total electric power delivered to the light-emitting unit and at the same time the motion sensing unit is activated;

wherein when a motion signal is detected by the motion sensing unit, the controller operates to output at least the second control signal to increase at least the second conduction rate of at least the second semiconductor switching device to increase the total electric power delivered to the light emitting unit to perform a second illumination mode with a second level illumination characterized with a second light intensity and a second mingled color temperature for a second predetermined time duration before being switched back to a turned off state, wherein the second light intensity of the second level illumination is equal to or higher than the first light intensity of the first level illumination;

wherein when the ambient light detected by the light sensing control unit is higher than a second predetermined value, the light-emitting unit including the first LED lighting load and the second LED lighting load being controlled by the light sensing control unit is switched off;

wherein the at least one external control unit generates at least one external control signal for adjusting or selecting at least one operating parameter of the light intensity, the mingled color temperature, a time length for the first predetermined time duration or the second predetermined time duration of the light-emitting unit in the first illumination mode or in the second illumination mode;

wherein the LEDs of the first LED lighting load and the LEDs of the second LED lighting load are respectively designed with a configuration of in series and/or in parallel connections such that when incorporated with an adequate setting of a power source of the power supply unit an electric current passing through each LED of the first LED lighting load and each LED of the second LED lighting load remains at an adequate level such that a voltage V across each LED complies with an operating constraint of V_th<

V<

V_max featuring electrical characteristics of a LED, where V_th is a threshold voltage required to trigger the LED to start emitting light and V_max is a maximum operating voltage across each LED to avoid an effect of a thermal runaway which results in burning out the LED or damaging an LED construction resulting in a shortened LED lifetime.

58. The lifestyle LED security light according to claim 57, wherein the first mingled color temperature of the first level illumination in performing the first illumination mode is the low color temperature, wherein the second semiconductor switching device is in a cutoff state and the controller outputs only the first control signal to control the first conduction rate of the first semiconductor switching device to deliver the total electric power to the light emitting unit to determine the light intensity of the first illumination mode.

59. The lifestyle LED security light according to claim 57, wherein the second mingled color temperature of the second level illumination in performing the second illumination mode is the high color temperature, wherein the first semiconductor switching device is in a cutoff state and the controller outputs only the second control signal to control the second conduction rate of the second semiconductor switching device to deliver the total electric power to the light emitting unit to determine the light intensity of the second illumination mode.

60. The lifestyle LED security light according to claim 57, wherein when the light-emitting unit is in the first illumination mode, a light intensity of the first LED lighting load and a light intensity of the second LED lighting load are respectively adjustable to tune the mingled color temperature of the diffused light created thru the light diffuser;

wherein upon receiving an external control signal from the external control unit the controller operates to simultaneously but reversely adjust the light intensity of the first LED lighting load and the light intensity of the second LED lighting load with the same pace;

wherein for changing to a lower mingled color temperature, the controller upon receiving the external control signal operates to control the first semiconductor switching device to increase the first electric power delivered to the first LED lighting load and at the same time proportionally decrease the second electric power delivered to the second LED lighting load;

wherein for changing to a higher mingled color temperature, the controller upon receiving the external control signal operates to control the first semiconductor switching device to decrease the first electric power delivered to the first LED lighting load and at the same time proportionally increase the second electric power delivered to the second LED lighting load.

61. The lifestyle LED security light according to claim 60, wherein when the light-emitting unit is in the first illumination mode, the controller is programmed with a color temperature tuning scheme, wherein paired combinations of different light intensities between operating the first LED lighting load and operating the second LED lighting load for creating different mingled color temperatures are preprogrammed and stored in a memory unit addressable by the controller for operating a pick and play process according to the external control signal received and interpreted by the controller for performing a selected mingled color temperature.

62. The lifestyle LED security light according to claim 57, wherein when the light-emitting unit is in the second illumination mode, a light intensity of the first LED lighting load and a light intensity of the second LED lighting load are respectively adjustable to tune the mingled color temperature thru the light diffuser;

wherein upon receiving an external control signal from the external control unit the controller operates to simultaneously but reversely adjust the light intensity of the first LED lighting load and the light intensity of the second LED lighting load with the same pace;

wherein for changing to a lower mingled color temperature, the controller upon receiving the external control signal operates to control the first semiconductor switching device to increase the first electric power delivered to the first LED lighting load and at the same time operates to control the second semiconductor switching device to proportionally decrease the second electric power delivered to the second LED lighting load;

wherein for changing to a higher mingled color temperature, the controller upon receiving the external control signal operates to control the first semiconductor switching device to decrease the first electric power delivered to the first LED lighting load and at the same time operates to control the second semiconductor switching device to proportionally increase the second electric power delivered to the second LED lighting load.

63. The lifestyle LED security light according to claim 62, wherein when the light-emitting unit is in the second illumination mode, the controller is programmed with a color temperature tuning scheme, wherein paired combinations of different light intensities between operating the first LED lighting load and operating the second LED lighting load for creating different mingled color temperatures are preprogrammed and stored in a memory unit addressable by the controller for operating a pick and play process according to the external control signal received and interpreted by the controller for performing a selected mingled color temperature.

64. The lifestyle LED security light according to claim 57, wherein the at least one external control unit includes at least one voltage divider operated by a user to output a voltage signal for adjusting or selecting the light intensity, the mingled color temperature or a time length for the first predetermined time duration or the second predetermined time duration of the light-emitting unit in the first illumination mode or in the second illumination mode.

65. The lifestyle LED security light according to claim 57, wherein the at least one external control unit includes at least one push button or one touch pad to output a voltage signal with a time length corresponding to a time duration that the push button or the touch pad being operated by a user for adjusting or selecting the light intensity, the mingled color temperature or a time length for the first predetermined time duration or the second predetermined time duration of the light emitting unit respectively in the first illumination mode or in the second illumination mode.

66. The lifestyle LED security light according to claim 57, wherein the at least one external control unit includes at least one wireless signal receiver to receive a wireless signal from a mobile device for adjusting or selecting the light intensity, the mingled color temperature or a time length for the first predetermined time duration or the second predetermined time duration of the light emitting unit respectively in the first illumination mode or the second illumination mode.

67. A lifestyle LED security light comprising:

a light-emitting unit, configured with a first LED lighting load for emitting light with a low color temperature, a second LED lighting load for emitting light with a high color temperature and a diffuser covering the first LED lighting load and the second LED lighting load to create a diffused light with a mingled color temperature;

a loading and power control unit;

a light sensing control unit;

a motion sensing unit;

a power supply unit; and

at least one external control unit;

wherein the loading and power control unit comprises a controller and a switching circuitry, wherein the controller is electrically and respectively coupled with the light sensing control unit, the motion sensing unit, the switching circuitry and the at least one external control unit ;

wherein the switching circuitry comprises at least a first semiconductor switching device and a second semiconductor switching device;

wherein the first LED lighting load and the second LED lighting load are connected in parallel and are further respectively and electrically coupled to the first semiconductor switching device and the second semiconductor switching device;

wherein the controller outputs a first control signal to control a first conduction rate of the first semiconductor switching device for delivering a first electric power to the first LED lighting load and simultaneously a second control signal to control a second conduction rate of the second semiconductor switching device for delivering a second electric power to the second LED lighting load such that the light-emitting unit respectively generates illuminations of different light intensities and different mingled color temperatures for performing different illumination modes according to signals respectively received from the light sensing control unit, the motion sensing unit and the at least one external control unit;

wherein when an ambient light detected by the light sensing control unit is lower than a first predetermined value, the light-emitting unit being controlled by the light sensing control unit is switched on to perform a first illumination mode with the motion sensing unit being temporarily deactivated;

wherein the controller outputs at least the first control signal to control at least the first conduction rate of at least the first semiconductor switching device such that a total electric power is delivered to the light-emitting unit to perform the first illumination mode with a first level illumination characterized with a first light intensity and a first mingled color temperature for a first predetermined time duration;

wherein upon a maturity of the first predetermined time duration the loading and power control unit manages to reduce the total electric power delivered to the light-emitting unit to generate a low level illumination characterized by a low light intensity and at the same time the motion sensing unit is activated;

wherein when a motion signal is detected by the motion sensing unit, the controller operates to output at least the second control signal to increase at least the second conduction rate of at least the second semiconductor switching device to increase the total electric power delivered to the light emitting unit to perform a second illumination mode with a second level illumination characterized by a second light intensity and a second mingled color temperature for a second predetermined time duration before being switched back to the low level illumination, wherein the second light intensity of the second level illumination is equal to or higher than the first light intensity of the first level illumination, wherein the first light intensity is equal to or higher than the low light intensity of the low level illumination;

wherein when the ambient light detected by the light sensing control unit is higher than a second predetermined value, the light-emitting unit including the first LED lighting load and the second LED lighting load being controlled by the light sensing control unit is switched off;

wherein the at least one external control unit generates at least one external control signal for adjusting or selecting at least one operating parameter of the light intensity, the mingled color temperature or a time length for the first predetermined time duration or the second predetermined time duration of the light-emitting unit in the first illumination mode or in the second illumination mode;

wherein the LEDs of the first LED lighting load and the LEDs of the second LED lighting load are respectively designed with a configuration of in series and/or in parallel connections such that when incorporated with an adequate setting of a power source of the power supply unit an electric current passing through each LED of the first LED lighting load and each LED of the second LED lighting load remains at an adequate level such that a voltage V across each LED complies with an operating constraint of V_th<

V<

V_max featuring electrical characteristics of a LED, where V_th is a threshold voltage required to trigger the LED to start emitting light and V_max is a maximum operating voltage across each LED to avoid an effect of a thermal runaway which results in burning out the LED or damaging an LED construction resulting in a shortened LED lifetime.

68. The lifestyle LED security light according to claim 67, wherein the first mingled color temperature in performing the first illumination mode is the low color temperature, wherein the second semiconductor switching device is in a cutoff state and the controller outputs only the first control signal to control the first conduction rate of the first semiconductor switching device to deliver the total electric power to the light emitting unit to determine the light intensity of the first illumination mode.

69. The lifestyle LED security light according to claim 67, wherein the second mingled color temperature in performing the second illumination mode is the high color temperature, wherein the first semiconductor switching device is in a cutoff state and the controller outputs only the second control signal to control the second conduction rate of the second semiconductor switching device to deliver the total electric power to the light emitting unit to determine the light intensity of the second illumination mode.

70. The lifestyle LED security light according to claim 67, wherein when the light-emitting unit is in the first illumination mode, a light intensity of the first LED lighting load and a light intensity of the second LED lighting load are respectively adjustable to tune the mingled color temperature of the diffused light created thru the light diffuser;

wherein upon receiving an external control signal from the at least one external control unit the controller operates to simultaneously but reversely adjust the light intensity of the first LED lighting load and the light intensity of the second LED lighting load with the same pace;

wherein for changing to a lower mingled color temperature, the controller upon receiving the external control signal operates to control the first semiconductor switching device to increase the first electric power delivered to the first LED lighting load and at the same time proportionally decrease the second electric power delivered to the second LED lighting load;

wherein for changing to a higher mingled color temperature, the controller upon receiving the external control signal operates to control the first semiconductor switching device to decrease the first electric power delivered to the first LED lighting load and at the same time proportionally increase the second electric power delivered to the second LED lighting load.

71. The lifestyle LED security light according to claim 70, wherein when the light-emitting unit is in the first illumination mode, the controller is programmed with a color temperature tuning scheme, wherein paired combinations of different light intensities between operating the first LED lighting load and operating the second LED lighting load for creating different mingled color temperatures are preprogrammed and stored in a memory unit addressable by the controller for operating a pick and play process according to the external control signal received and interpreted by the controller for performing a selected mingled color temperature.

72. The lifestyle LED security light according to claim 67, wherein when the light-emitting unit is in the second illumination mode, a light intensity of the first LED lighting load and a light intensity of the second LED lighting load are respectively adjustable to tune the mingled color temperature thru the light diffuser;

wherein upon receiving an external control signal from the at least one external control unit the controller operates to simultaneously but reversely adjust the light intensity of the first LED lighting load and the light intensity of the second LED lighting load with the same pace;

wherein for changing to a lower mingled color temperature, the controller upon receiving the external control signal operates to control the first semiconductor switching device to increase the first electric power delivered to the first LED lighting load and at the same time operates to control the second semiconductor switching device to proportionally decrease the second electric power delivered to the second LED lighting load;

wherein for changing to a higher mingled color temperature, the controller upon receiving the external control signal operates to control the first semiconductor switching device to decrease the first electric power delivered to the first LED lighting load and at the same time operates to control the second semiconductor switching device to proportionally increase the second electric power delivered to the second LED lighting load.

73. The lifestyle LED security light according to claim 72, wherein when the light-emitting unit is in the second illumination mode, the controller is programmed with a color temperature tuning scheme, wherein paired combinations of different light intensities between operating the first LED lighting load and operating the second LED lighting load for creating different mingled color temperatures are preprogrammed and stored in a memory unit addressable by the controller for operating a pick and play process according to the external control signal received and interpreted by the controller for performing a selected mingled color temperature.

74. The lifestyle LED security light according to claim 67, wherein the at least one external control unit includes at least one voltage divider operated by a user to output a voltage signal for adjusting or selecting the light intensity, the mingled color temperature or a time length for the first predetermined time duration or the second predetermined time duration of the light-emitting unit in the first illumination mode or in the second illumination mode.

75. The lifestyle LED security light according to claim 67, wherein the at least one external control unit includes at least one push button or one touch pad to output a voltage signal with a time length corresponding to a time duration that the push button or the touch pad being operated by a user for adjusting or selecting the light intensity, the mingled color temperature or a time length for the first predetermined time duration or the second predetermined time duration of the light emitting unit respectively in the first illumination mode or in the second illumination mode.

76. The lifestyle LED security light according to claim 67, wherein the at least one external control unit includes at least one wireless signal receiver to receive a wireless signal from a mobile device for adjusting or selecting the light intensity, the mingled color temperature or a time length for the first predetermined time duration or the second predetermined time duration of the light emitting unit respectively in the first illumination mode or the second illumination mode.