Light emitting device (LED) light fixture control systems and related methods

• US 9,345,091 B2
• Filed: 02/08/2013
• Issued: 05/17/2016
• Est. Priority Date: 02/08/2013
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Pickard, Paul K., Harris, Michael James, Trott, Gary D.
• Primary Examiner(s): Le, Tung X
• Assistant Examiner(s): Sathiraju, Srinivas
• Application Number:
  US13/762,923
• Publication Number:
  US 20140225511A1
• Time in Patent Office: 1,194 Days
• Field of Search: 315/151, 315/313
• US Class Current: 1/1
• 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 45/58 involving end of life detection of LEDs
• CPC Class Codes: H05B 47/11 by determining the brightness or colour temperature of ambient light
• CPC Class Codes: H05B 47/155 Coordinated control of two or more light sources
• CPC Class Codes: H05B 47/20 Responsive to malfunctions or to light source life; for protection
• CPC Class Codes: Y02B 20/40 Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

Light emitting device (LED) light fixture control systems and related methods are disclosed. A system and method in one aspect can include at least one LED configured to emit light at an illumination output level and at least one light sensor configured to measure the illumination output level of light emitted by the LED. A system and method can also include a control unit configured to detect the illumination output level emitted by the at least one LED falling below an original illumination output level and to increase the illumination output level by the at least one LED to produce a predetermined lighting level associated with the original illumination output level in an area.

Claims

1. A light emitting device (LED) lighting system comprising:

at least one LED configured to emit light at an illumination output level;

at least one light sensor configured to measure the illumination output level of light emitted by the at least one LED and an ambient light level in proximity to the at least one LED; and

a control unit, the control unit configured;

to detect a light level that comprises both the illumination output level emitted by the at least one LED and the ambient light level falling below an original illumination output level in an area, wherein the original illumination output level comprises a stored numerical value that represents a portion or percentage of a maximum illumination output level of the at least one LED and is established based on a predetermined lighting level in the area; and

to increase the illumination output level by the at least one LED to produce the predetermined lighting level associated with the original illumination output level in the area.

2. The system of claim 1 wherein the control unit is configured to determine the original illumination output level of the at least one LED that produces the predetermined lighting level in the area.

3. The system of claim 1 wherein the control unit is further configured to monitor the illumination output level on a periodic basis.

4. The system of claim 1 wherein the control unit is further configured to monitor the illumination output level on a nightly basis.

5. The system of claim 1 wherein the original illumination output level of the at least one LED is stored in a memory module at the control unit.

6. The system of claim 1 wherein the original illumination output level of the at least one LED is locally stored in an LED light fixture containing the LED.

7. The system of claim 1 wherein the control unit is configured to increase the illumination output level by the at least one LED on an individual basis.

8. The system of claim 1 wherein the control unit is configured to increase the illumination output level by the at least one LED on a group basis.

9. The system of claim 1 wherein the at least one LED is used as a light sensor in a non-light emitting state.

10. The system of claim 1 wherein the light sensor comprises a light sensor device that is separate from the at least one LED.

11. The system of claim 1 wherein the at least one light sensor is configured to measure at least one of:

a brightness level and a color level.

12. The system of claim 1 wherein the control unit is configured to consider the ambient light level in the event the illumination output level by the at least one LED is increased to produce the predetermined lighting level in the area.

13. The system of claim 1 wherein the illumination output level of the light emitted by the LED includes reflected light in the area.

14. The system of claim 13 wherein the control unit detects the illumination output level emitted by the at least one LED falling below the original illumination output level using a moving average of illumination output level measurements taken by the at least one light sensor.

15. A light emitting device (LED) lighting system comprising:

at least one LED light fixture, wherein the LED light fixture comprises an LED for generating an illumination output level;

at least one light sensor for measuring the illumination output level emitted by the at least one LED light fixture; and

a control unit configured to;

determine a high end trim level of the at least one LED light fixture, wherein the high end trim level comprises a percentage of a maximum illumination output level of the at least one LED light fixture that corresponds to an original illumination output level that produces a visual comfort level in an area;

detect the illumination output level emitted by the at least one LED light fixture falling below the original illumination output level; and

adjust the high end trim level of the at least one LED light fixture to increase the illumination output level by the at least one LED light fixture to produce the visual comfort level in the area.

16. The system of claim 15 wherein the control unit is further configured to monitor the illumination output level on a periodic basis.

17. The system of claim 15 wherein the control unit is further configured to monitor the illumination output level on a nightly basis.

18. The system of claim 15 wherein the original illumination output level of the at least one LED light fixture is stored in a memory module at the control unit.

19. The system of claim 15 wherein the original illumination output level of the at least one LED light fixture is locally stored in the at least one LED light fixture.

20. The system of claim 15 wherein the control unit is configured to increase the illumination output level by the at least one LED light fixture on an individual basis.

21. The system of claim 15 wherein the control unit is configured to increase the illumination output level by the at least one LED light fixture on a group basis.

22. The system of claim 15 wherein the light sensor is integrated within the at least one LED light fixture.

23. The system of claim 15 wherein the light sensor is configured to measure at least one of:

a brightness level and a color level.

24. The system of claim 15 wherein the at least one LED is used as a light sensor in a non-light emitting state.

25. The system of claim 15 wherein the light sensor comprises a light sensor device that is separate from the at least one LED light fixture.

26. The system of claim 15 wherein the light sensor is configured to measure ambient light that is proximate to the at least one LED light fixture.

27. The system of claim 15 wherein the control unit is configured to consider ambient light that is proximate to the at least one LED light fixture in the event the illumination output level by the at least one LED light fixture is increased to produce the visual comfort level in the area.

28. The system of claim 15 wherein the visual comfort level is established via input received from a system administrator.

29. The system of claim 15 wherein the visual comfort level is established by utilizing preloaded illumination output level data accessible by the control unit.

30. The system of claim 15 wherein the illumination output level emitted by the LED includes reflected light in the area.

31. The system of claim 30 wherein the control unit detects the illumination output level emitted by the LED falling below the original illumination output level using a moving average of illumination output level measurements taken by the at least one light sensor.

32. A method for operating at least one light emitting device (LED), comprising:

detecting a light level that comprises both a current illumination output level in an area emitted by at least one LED and an ambient light level in proximity to the at least one LED falling below an original illumination output level, wherein the original illumination output level comprises a stored numerical value that represents a portion or percentage of a maximum illumination output level of the at least one LED and is established based on a desired lighting level; and

adjusting the at least one LED to increase the current illumination output level in the area to produce the desired lighting level.

33. The method of claim 32 comprising establishing the desired lighting level in the area, wherein the desired lighting level is associated with the original illumination output level emitted by the at least one LED.

34. The method of claim 32 comprising determining if the current illumination output level emitted by the at least one LED falls below the original illumination output level on a periodic basis.

35. The method of claim 34 wherein the periodic basis comprises a nightly basis.

36. The method of claim 32 wherein the original illumination output level of the at least one LED is stored in a memory module at a control unit that is communicatively connected to the at least one LED.

37. The method of claim 32 wherein the original illumination output level of the at least one LED is locally stored in an LED light fixture that contains the LED.

38. The method of claim 32 wherein the illumination output level by the at least one LED is increased on an individual basis.

39. The method of claim 32 wherein the illumination output level by the at least one LED is increased on a group basis.

40. The method of claim 32 wherein detecting the current illumination output level emitted by the at least one LED comprises receiving, at a control unit communicatively connected to the at least one LED, readings associated with the current illumination output levels from at least one light sensor.

41. The method of claim 40 wherein the at least one light sensor is integrated within the at least one LED.

42. The method of claim 40 wherein the at least one light sensor comprises at least one light sensor device that is separate from the at least one LED.

43. The method of claim 32 wherein the ambient light level is considered along with the current illumination output level by the at least one LED to produce the desired lighting level in the area.

44. The method of claim 40 wherein the at least one light sensor is configured to measure at least one of:

a brightness level and a color level.

45. The method of claim 32 wherein the at least one LED is used as a light sensor in a non-light emitting state.

46. The method of claim 33 wherein the desired lighting level is established via input received from a system administrator.

47. The method of claim 33 wherein the desired lighting level is established by utilizing preloaded illumination output level data accessible by a control unit.

48. The method of claim 32 wherein detecting the current illumination output level in the area includes detecting reflected light in the area.

49. The method of claim 48 wherein detecting the current illumination output level includes detecting the current illumination output level emitted by the at least one LED falling below the original illumination output level using a moving average of a plurality of illumination output level measurements taken by at least one light sensor.

50. A method for operating at least one light emitting device (LED) light fixture in a lighting system, comprising:

establishing a visual comfort level in an area, wherein the visual comfort level is associated with an original illumination output level emitted by at least one LED light fixture;

determining a high end trim level of the at least one LED light fixture, wherein the high end trim level is a percentage of a maximum illumination output level of the at least one LED light fixture and corresponds to the original illumination output level that produces the visual comfort level in the area;

detecting a current illumination output level emitted by the at least one LED light fixture falling below the original illumination output level; and

adjusting the high end trim level of the at least one LED light fixture to increase the current illumination output level by the at least one LED light fixture to produce the visual comfort level in the area.

51. The method of claim 50 comprising determining if the current illumination output level emitted by the at least one LED light fixture falls below the original illumination output level on a periodic basis.

52. The method of claim 50 wherein the periodic basis comprises a nightly basis.

53. The method of claim 50 wherein the original illumination output level of the at least one LED light fixture is stored in a memory module at a control unit that is communicatively connected to the at least one LED light fixture.

54. The method of claim 50 wherein the original illumination output level of the at least one LED light fixture is locally stored in the at least one LED light fixture.

55. The method of claim 50 wherein the illumination output level by the at least one LED light fixture is increased on an individual basis.

56. The method of claim 50 wherein the illumination output level by the at least one LED light fixture is increased on a group basis.

57. The method of claim 50 wherein detecting the current illumination output level emitted by the at least one LED light fixture comprises receiving, at a control unit communicatively connected to the at least one LED light fixture, readings associated with the current illumination output levels from at least one light sensor.

58. The method of claim 57 wherein the at least one light sensor is integrated within the at least one LED light fixture.

59. The method of claim 57 wherein the at least one light sensor comprises at least one light sensor device that is separate from the at least one LED light fixture.

60. The method of claim 57 wherein the at least one light sensor is configured to measure ambient light that is proximate to the at least one LED light fixture.

61. The method of claim 57 wherein the at least one light sensor is configured to measure at least one of:

a brightness level and a color level.

62. The method of claim 50 wherein the at least one LED light fixture is used as a light sensor in a non-light emitting state.

63. The method of claim 50 wherein the ambient light that is proximate to the at least one LED light fixture is considered along with the current illumination output level by the at least one LED light fixture to produce the visual comfort level in the area.

64. The method of claim 50 wherein the visual comfort level is established via input received from a system administrator.

65. The method of claim 50 wherein the visual comfort level is established by utilizing preloaded illumination output level data accessible by a control unit.

66. The method of claim 50 wherein the current illumination output level emitted by the LED light fixture includes reflected light in the area.

67. The method of claim 66 wherein detecting the current illumination output level includes detecting the current illumination output level emitted by the at least one LED light fixture falling below the original illumination output level using a moving average of illumination output level measurements taken by at least one light sensor in the area.

68. A method for monitoring light, comprising:

determining an original illumination output level in an area emitted by at least one light and an ambient light level in proximity to the at least one light;

detecting a light level that comprises both a current illumination output level in the area resulting from the at least one light and the ambient light level falling below the original illumination output level, wherein the original illumination output level comprises a stored numerical value that represents a portion or percentage of a maximum illumination output level of the at least one light and is established based on a predetermined lighting level in the area; and

adjusting the at least one light to increase the current illumination output level to produce the predetermined lighting level in the area.