MULTI-CHIP LIGHT EMITTING DIODE LIGHT DEVICE

• US 20100244740A1
• Filed: 06/08/2010
• Published: 09/30/2010
• Est. Priority Date: 08/24/2007
• Status: Active Grant

• Current Assignee: Photonic Developments LLC
• Original Assignee: Photonic Developments LLC
• Inventors: CAROME, Edward F., HANSLER, Richard L., KUBULINS, Vilnis E., ALPERT, Martin A.
• Granted Patent: US 9,374,876 B2
• Time in Patent Office: Days
• US Class Current: 315/297
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H05B 47/16 by timing means
• CPC Class Codes: Y02B 20/40 Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

An electric lamp includes a first light source and a second light source and power circuitry configured to selectively energize the first light source and the second light source. The first light source is configured to produce light that is substantially free of wavelengths below about 530 nanometers, and the second light source is configured to product light having wavelengths of less than about 530 nanometers. The electric lamp is configured to produce white or near-white light in a variety of color temperatures, while retaining good color rendering index.

Claims

1. A lamp comprising:

a first light source;

a second light source; and

power circuitry configured to selectively energize the first light source and/or the second light source;

wherein the first light source is configured to produce light that is substantially free of wavelengths below about 530 nanometers (nm), and the second light source is configured to produce light having wavelengths of less than about 530 nm.

2. The lamp of claim 1, wherein the first light source and the second light source are configured to produce substantially white light when they are both energized.

3. The lamp of claim 1, wherein the power circuitry is configured to control the intensities of the first light source and the second light source to provide substantially white light over a range of color temperatures.

4. The lamp of claim 1, wherein the first light source is configured to produce light in a wavelength range that is substantially free of the wavelength spectrum most effective in suppressing the production of melatonin.

5. The lamp of claim 1, wherein the first light source includes a first light emitting diode (LED) and a conversion material at least partially covering the LED.

6. The lamp of claim 5, wherein the first light source comprises a LED chip that produces light having a peak wavelength of about 365 nm to about 400 nm and a phosphor positioned to receive at least a portion of the light from the LED chip, wherein the phosphor is configured to emit light having wavelengths greater than about 530 nm.

7. The lamp of claim 5, wherein the first light source comprises a LED chip that produces light having a peak wavelength of about 400 nm to about 440 nm and a phosphor positioned to receive at least a portion of the light from the LED chip, wherein the phosphor is configured to emit light having wavelengths greater than about 530 nm.

8. The lamp of claim 5, wherein the first LED is configured to emit light in the ultra violet (UV) wavelength spectrum.

9. The lamp of claim 8, wherein the second light source is a second LED configured to emit light at wavelengths less than about 530 nm.

10. The lamp of claim 9, wherein the first LED and the second LED are positioned to illuminate a phosphor material.

11. The lamp of claim 1, wherein the first light source and the second light source are cooperative to produce white light.

13. The lamp of claim 8, further comprising a plurality of additional LEDs, operatively coupled to the power circuitry and selectively energizable by the power circuitry, wherein the plurality of additional LEDs includes at least one blue LED, at least one cyan LED and at least one green LED.

14. The lamp of claim 13, wherein the first LED, the second LED and the plurality of additional LEDs are selectively operational to provide white light or substantially white light at a plurality of different color temperatures.

15. The lamp of claim 13, further comprising:

detection circuitry configured to detect the intensity of the light output from the lamp and/or the color temperature of the light output from the lamp; and

a controller operatively coupled to the detection circuitry, wherein the controller is configured to control the intensity of the first LED, the second LED and the plurality of additional LEDs in response to signals received from the detection circuitry relating to the intensity and/or color temperature of the light output from the lamp.

16. The lamp of claim 15, wherein the controller is configured to control power to the first LED, the second LED and the plurality of additional LEDs to maintain a predetermined intensity and/or color temperature of the light output from the lamp.

17. The lamp of claim 1, further comprising:

a filter positioned to receive light from the first light source and/or the second light source, wherein the filter is configured to absorb light within a wavelength range of about 450 nm to about 480 nm.

18. The lamp of claim 1, further comprising:

a filter positioned to receive light from the first light source and/or the second light source, wherein the filter is configured to absorb light within a wavelength range of about 470 nm to about 480 nm.

19. A lamp comprising:

a plurality of light emitting diodes (LEDs);

circuitry operatively coupled to the plurality of LEDs and configured to selectively energize each of the plurality of LEDs; and

a filter positioned to receive light output from at least some of the plurality of LEDs, wherein the filter is configured to absorb light within a wavelength range of about 450 nm to about 480 nm.

20. The lamp of claim 19, wherein the plurality of LEDs are cooperative to produce light substantially white light at a plurality of controllable color temperatures.

22. The lamp of claim 19, wherein the second LED is configured to produce blue light at wavelengths less than about 530 nm.

23. The lamp of claim 22, further comprising a plurality of additional LEDs of different colors, the additional LEDs being positioned outside the housing, operatively coupled to the circuitry and selectively energizable by the circuitry.

24. The lamp of claim 23, wherein the first excitation LED, the second LED and the plurality of additional LEDs are selectively operational to provide white light or substantially white light at a plurality of different color temperatures.

25. The lamp of claim 24, further comprising:

a detector operatively coupled to the controller, the detector being configured to detect the intensity of the light output from the lamp and/or the color temperature of the light output from the lamp; and

wherein the controller is configured to control power to the first excitation LED, the second LED and the plurality of additional LEDs in response to signals received from the detector relating to the intensity and/or color temperature of the light output from the lamp.

26. The lamp of claim 25, wherein the controller is configured to control the circuitry to maintain a predetermined intensity and/or color temperature of the light output from the lamp.

21. A lamp comprising:

a housing at least partially covered by a conversion material;

a first excitation light emitting diode (LED) disposed within the housing;

a second LED disposed within the housing; and

a controller configured to selectively energize the first excitation LED and the second LED;

wherein the first excitation LED is positioned to provide light to the conversion material, and the conversion material is configured to produce white light substantially free of visible wavelengths below about 530 nanometers (nm) in response to light from the first excitation LED.