Lighting device having first, second and third groups of solid state light emitters, and lighting arrangement

• US 8,716,952 B2
• Filed: 08/04/2009
• Issued: 05/06/2014
• Est. Priority Date: 08/04/2009
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Van de Ven, Antony Paul
• Primary Examiner(s): Owens, Douglas W
• Assistant Examiner(s): PHAM, THAI N
• Application Number:
  US12/535,319
• Publication Number:
  US 20110031894A1
• Time in Patent Office: 1,736 Days
• Field of Search: 315/185.R, 315/291, 315/294, 315/297, 313/498, 313501-503, 362/231, 362/545, 362/612, 362/800
• US Class Current: 315/294
• CPC Class Codes: F21K 9/62 using mixing chambers, e.g. housings with reflective walls
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/12 characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• 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: H05B 44/00 Circuit arrangements for operating electroluminescent light sources for operating light emitting diodes H05B45/00
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]

Abstract

A lighting device comprising first, second and third groups of solid state light emitters, the first group emitting light having a dominant wavelength of 430 to 490 nm, the second group at 525 to 575 (in some devices 540 to 575 nm), the third group at 610 to 640 nm. In some devices, wavelength of light from emitters in first and second groups, and light from second and third groups, differs by at least 70 nm. Some devices emit light having CRI Ra of at least 70 when first, second and third groups of emitters are illuminated. Also, a lighting arrangement comprising first, second and third groups as above, in addition to a fourth emitter emitting light of dominant wavelength outside the ranges for the first, second and third groups, and not more than 10 nm different from a dominant wavelength of a color on an item to be illuminated.

Claims

1. A lighting device comprising:

a first group of solid state light emitters;

a second group of solid state light emitters; and

a third group of solid state light emitters,

the first group of solid state light emitters comprising at least a first solid state light emitter, each solid state light emitter in the first group of solid state light emitters emitting light having a dominant wavelength within a range of from about 430 nm to about 490 nm,

the second group of solid state light emitters comprising at least a second solid state light emitter, each solid state light emitter in the second group of solid state light emitters emitting light having a dominant wavelength within a range of from about 525 nm to about 575 nm, and

the third group of solid state light emitters comprising at least a third solid state light emitter, each solid state light emitter in the third group of solid state light emitters emitting light having a dominant wavelength within a range of from about 610 nm to about 640 nm,

each solid state light emitter in the second group of solid state light emitters having a dominant wavelength that differs from a dominant wavelength of each solid state light emitter in the third group of solid state light emitters by at least 70 nm.

2. A lighting device as recited in claim 1, wherein a combination of light emitted by the first group of solid state light emitters, the second group of solid state light emitters and the third group of solid state light emitters is within ten MacAdam ellipses of at least one point on the blackbody locus.

3. A lighting device as recited in claim 1, wherein the first group of solid state light emitters, the second group of solid state light emitters and the third group of solid state light emitters comprise all of the light emitters in the lighting device.

4. A lighting device as recited in claim 1, wherein the lighting device further comprises:

at least a fourth solid state light emitter that emits light that has a dominant wavelength that is outside each of the ranges of wavelength for the first, second and third groups of solid state light emitters, and

a controller configured to adjust the intensity of light emitted by at least one solid state light emitter selected from among the first group of solid state light emitters, the second group of solid state light emitters, the third group of solid state light emitters and the fourth solid state light emitter, to maintain light emitted by the lighting device within ten MacAdam ellipses of at least one point on the blackbody locus.

5. An illuminated enclosure, comprising an enclosed space and at least one lighting device as recited in claim 1, wherein said lighting device illuminates at least a portion of said enclosed space.

6. An illuminated surface, comprising a surface and at least one lighting device as recited in claim 1, wherein if said lighting device is illuminated, said lighting device would illuminate at least a portion of said surface.

7. An illuminated area, comprising at least one item selected from among the group consisting of a swimming pool, a room, a warehouse, an indicator, a road, a vehicle, a road sign, a billboard, a ship, a toy, a minor, a vessel, an electronic device, a boat, an aircraft, a stadium, a computer, a remote audio device, a remote video device, a cell phone, a tree, a window, a yard, a lamppost, an indicator light, or a device or array of devices that illuminate an enclosure, or a device that is used for edge or back-lighting, having mounted therein or thereon at least one lighting device as recited in claim 1.

8. A lighting device as recited in claim 1, wherein each solid state light emitter in the first group of solid state light emitters has a dominant wavelength that differs from a dominant wavelength of each solid state light emitter in the second group of solid state light emitters by at least 70 nm.

9. A lighting arrangement comprising:

a lighting device; and

at least a first item which is illuminated when said lighting device emits light, said lighting device comprising;

a first group of solid state light emitters;

a second group of solid state light emitters;

a third group of solid state light emitters; and

at least a fourth light source,

the first group of solid state light emitters comprising at least a first solid state light emitter, each solid state light emitter in the first group of solid state light emitters emitting light having a dominant wavelength within a range of from about 430 nm to about 490 nm,

the second group of solid state light emitters comprising at least a second solid state light emitter, each solid state light emitter in the second group of solid state light emitters emitting light having a dominant wavelength within a range of from about 525 nm to about 575 nm,

the third group of solid state light emitters comprising at least a third solid state light emitter, each solid state light emitter in the third group of solid state light emitters emitting light having a dominant wavelength within a range of from about 610 nm to about 640 nm,

the fourth light source emitting light that has a dominant wavelength that is outside each of the ranges of wavelength for the first, second and third groups of solid state light emitters, and not more than 10 nm different from a dominant wavelength of at least one color on the first item,

each solid state light emitter in the second group of solid state light emitters having a dominant wavelength that differs from a dominant wavelength of each solid state light emitter in the third group of solid state light emitters by at least 70 nm.

10. A lighting arrangement as recited in claim 9, wherein a combination of light emitted by the first group of solid state light emitters, the second group of solid state light emitters, the third group of solid state light emitters and the fourth light source is within ten MacAdam ellipses of at least one point on the blackbody locus.

11. A lighting arrangement as recited in claim 9, wherein:

the fourth light source comprises a fourth group of solid state light emitters, and

the lighting device further comprises a controller configured to adjust the intensity of light emitted by at least one solid state light emitter selected from among the first group of solid state light emitters, the second group of solid state light emitters, the third group of solid state light emitters and the fourth group of solid state light emitters, to maintain light emitted by the lighting device within ten MacAdam ellipses of at least one point on the blackbody locus.

12. A lighting arrangement as recited in claim 9, wherein the first item is selected from the group consisting of printed matter, signage, food products, saleable merchandise, works of art, plants, animals and humans.

13. An illuminated enclosure, comprising an enclosed space and at least one lighting arrangement as recited in claim 9, wherein said lighting arrangement illuminates at least a portion of said enclosed space.

14. An illuminated surface, comprising a surface and at least one lighting arrangement as recited in claim 9, wherein if said lighting arrangement is illuminated, said lighting arrangement would illuminate at least a portion of said surface.

15. An illuminated area, comprising at least one item selected from among the group consisting of a swimming pool, a room, a warehouse, an indicator, a road, a vehicle, a road sign, a billboard, a ship, a toy, a mirror, a vessel, an electronic device, a boat, an aircraft, a stadium, a computer, a remote audio device, a remote video device, a cell phone, a tree, a window, a yard, a lamppost, an indicator light, or a device or array of devices that illuminate an enclosure, or a device that is used for edge or back-lighting, having mounted therein or thereon at least one lighting arrangement as recited in claim 9.

16. A lighting arrangement as recited in claim 9, wherein said fourth light source comprises at least one solid state light emitter.

17. A lighting arrangement as recited in claim 9, wherein said fourth light source comprises a luminescent material.

18. A lighting arrangement as recited in claim 9, wherein the first group of solid state light emitters, the second group of solid state light emitters, the third group of solid state light emitters and the fourth light source comprise all of the light emitters in the lighting device.

19. A lighting device comprising:

a first group of solid state light emitters;

a second group of solid state light emitters;

a third group of solid state light emitters; and

a fourth light source,

the first group of solid state light emitters comprising at least a first solid state light emitter, each solid state light emitter in the first group of solid state light emitters emitting light having a dominant wavelength within a range of from about 430 nm to about 490 nm,

the second group of solid state light emitters comprising at least a second solid state light emitter, each solid state light emitter in the second group of solid state light emitters emitting light having a dominant wavelength within a range of from about 525 nm to about 575 nm,

the third group of solid state light emitters comprising at least a third solid state light emitter, each solid state light emitter in the third group of solid state light emitters emitting light having a dominant wavelength within a range of from about 610 nm to about 640 nm,

the fourth light source emitting light that has a dominant wavelength that is outside each of the ranges of wavelength for the first, second and third groups of solid state light emitters,

the lighting device configured to illuminate an item that comprises at least one color that is not more than 10 nm different from a dominant wavelength of light emitted from the fourth light source,

each solid state light emitter in the second group of solid state light emitters having a dominant wavelength that differs from a dominant wavelength of each solid state light emitter in the third group of solid state light emitters by at least 70 nm.

20. A lighting device as recited in claim 19, wherein said fourth light source comprises at least one solid state light emitter.

21. A lighting device as recited in claim 19, wherein said fourth light source comprises a luminescent material.

22. A lighting device as recited in claim 19, wherein a combination of light emitted by the first group of solid state light emitters, the second group of solid state light emitters, the third group of solid state light emitters and the fourth light source is within ten MacAdam ellipses of at least one point on the blackbody locus.

23. A lighting device as recited in claim 19, wherein the first group of solid state light emitters, the second group of solid state light emitters, the third group of solid state light emitters and the fourth light source comprise all of the light emitters in the lighting device.

24. A lighting device as recited in claim 19, wherein:

the fourth light source comprises a fourth group of solid state light emitters, and

the lighting device further comprises a controller configured to adjust the intensity of light emitted by at least one solid state light emitter selected from among the first group of solid state light emitters, the second group of solid state light emitters, the third group of solid state light emitters and the fourth solid state light emitters, to maintain light emitted by the lighting device within ten MacAdam ellipses of at least one point on the blackbody locus.

25. An illuminated enclosure, comprising an enclosed space and at least one lighting device as recited in claim 19, wherein said lighting device illuminates at least a portion of said enclosed space.

26. An illuminated surface, comprising a surface and at least one lighting device as recited in claim 19, wherein if said lighting device is illuminated, said lighting device would illuminate at least a portion of said surface.

27. An illuminated area, comprising at least one item selected from among the group consisting of a swimming pool, a room, a warehouse, an indicator, a road, a vehicle, a road sign, a billboard, a ship, a toy, a mirror, a vessel, an electronic device, a boat, an aircraft, a stadium, a computer, a remote audio device, a remote video device, a cell phone, a tree, a window, a yard, a lamppost, an indicator light, or a device or array of devices that illuminate an enclosure, or a device that is used for edge or back-lighting, having mounted therein or thereon at least one lighting device as recited in claim 19.