High CRI adjustable color temperature lighting devices

• US 8,511,851 B2
• Filed: 12/21/2009
• Issued: 08/20/2013
• Est. Priority Date: 12/21/2009
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated), Ideal Industries, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Negley, Gerald, Van de Ven, Antony P.
• Primary Examiner(s): DZIERZYNSKI, EVAN P
• Application Number:
  US12/643,705
• Publication Number:
  US 20110148327A1
• Time in Patent Office: 1,338 Days
• Field of Search: 362/231, 362/230, 362/253, 315/312
• US Class Current: 362/231
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

Solid state luminaires and light engines comprising a first group of solid state emitters comprising a first emitter emitting above the black body locus (BBL) in a CIE diagram, and a second emitter emitting below the BBL. The combination of light from the first and second emitters generates an emission color point within a standard deviation of the BBL. A second group of solid state emitters is included, the combination of light from the first and second groups of emitters causes emission within a standard deviation of the black body locus (BBL), wherein varying the intensity of the second group of emitters causes emission from the first and second groups of emitters to vary within a range of color temperatures while still emitting within the standard deviation of the BBL.

Claims

1. A solid state luminaire comprising:

a control group of solid state emitters comprising first and second solid state emitters emitting at different wavelengths; and

a variable group of solid state emitters, the combination of light from said control and variable groups causing emission within a standard deviation of the black body locus (BBL) in a CIE graph, the varying of emission intensity of said variable group of emitters causing the emission of the combined light from said control and variable emitters to vary within a range of color temperatures while emitting within said standard deviation of the BBL.

2. The luminaire of claim 1, wherein the emission point of said first solid state emitter is above the BBL in a CIE graph and the emission of said second solid state emitter is below the BBL.

3. The luminaire of claim 1, wherein said first solid state emitter comprises a blue shifted yellow (BSY) solid state emitter.

4. The luminaire of claim 1, wherein said second solid state emitter comprises a red emitting solid state emitter.

5. The luminaire of claim 1, wherein the ratio of emission between said first and second solid state emitters remains approximately constant when the emission from said variable emitters is varied.

6. The luminaire of claim 1, wherein said variable emitters comprise blue emitting solid state emitters.

7. The luminaire of claim 1, wherein said variable emitters comprise different types of emitters emitting at different colors of light.

8. The luminaire of claim 7, wherein the ratio of light from said different types of emitters remains constant as the emission of said variable group of emitters is varied.

9. The luminaire of claim 1, wherein said variable emitters comprise blue emitting solid state emitters and green emitting solid state emitters.

10. The luminaire of claim 1, wherein said variable emitters each comprise solid state emitter having a blue solid state emitter coated by a green phosphor.

11. The luminaire of claim 1, wherein the emission point from said variable group of emitters is to the left on the CIE graph of the emission points from said first and second solid state emitters.

12. The luminaire of claim 1, wherein the CRI of the combined emission from said control and variable groups has a CRI greater than 90 through said range of color temperatures.

13. The luminaire of claim 1, wherein said standard deviation is 0.01 delta u′

v′

of said BBL.

14. The luminaire of claim 1, wherein said range of color temperatures is approximately 2700 to 4000K.

15. The luminaire of claim 1, wherein said range of color temperatures is approximately 2700 to 5000K.

16. The luminaire of claim 1, wherein said range of color temperatures is approximately 2700 to 6500K.

17. The luminaire of claim 1, wherein said variable group of emitters emits light having a wavelength of approximately 488 nm and said range of color temperatures is approximately 2700 to 4000K.

18. The luminaire of claim 1, wherein said variable group of emitters emits light having a wavelength of approximately 487 nm and said range of color temperatures is approximately 2700 to 5000K.

19. The luminaire of claim 1, wherein said variable group of emitters emits light having a wavelength of approximately 485 nm and said range of color temperatures is approximately 2700 to 6500K.

20. The luminaire of claim 1, wherein said variable group of emitters comprises first and second emitters emitting wavelengths of light at 460 nm and 530 nm, and said range of color temperatures is approximately 2700 to 6500K.

21. A solid state luminaire comprising:

a control group of solid state emitters having a first emitter emitting light at a color point above the black body locus (BBL) in a CIE graph and a second emitter emitting light at a color point below the BBL; and

a variable group of emitters whose emission intensity can be varied to vary the combined emission of said control and variable emitters along a range of color temperatures while maintaining said emission within a standard deviation of a BBL.

22. The luminaire of claim 21, wherein said combination of light from said first and second emitters combines to a color point within a standard deviation of said BBL.

23. The luminaire of claim 21, wherein said first emitter comprises a blue shifted yellow (BSY) solid state emitter.

24. The luminaire of claim 21, wherein said second emitter comprises a red emitting solid state emitter.

25. The luminaire of claim 21, wherein the ratio of emission between said first and second solid state emitter remains approximately constant when the emission from said variable emitters is varied.

26. The luminaire of claim 21, wherein said variable emitters comprise blue emitting solid state emitters.

27. The luminaire of claim 21, wherein said variable emitters comprise different types of emitters emitting at different colors of light.

28. The luminaire of claim 27, wherein the ratio of light from said different types of emitters remains constant as the emission of said variable group of emitters is varied.

29. The luminaire of claim 21, wherein said variable emitters comprise blue emitting solid state emitters and green emitting solid state emitters.

30. The luminaire of claim 21, wherein said variable emitters each comprise solid state emitters having a blue solid state emitter coated by a green phosphor.

31. The luminaire of claim 21, wherein the emission point from said variable group of emitters is to the left on the CIE graph of the emission points from said first and second emitters.

32. The luminaire of claim 21, wherein said standard deviation is 0.01 delta u′

v′

of said BBL.

33. The luminaire of claim 21, wherein said variable group of emitters emits light having a wavelength of approximately 488 nm and said range of color temperatures is approximately 2700 to 4000K.

34. The luminaire of claim 21, wherein said variable group of emitters emits light having a wavelength of approximately 487 nm and said range of color temperatures is approximately 2700 to 5000K.

35. The luminaire of claim 21, wherein said variable group of emitters emits light having a wavelength of approximately 485 nm and said range of color temperatures is approximately 2700 to 6500K.

36. The luminaire of claim 21, wherein said variable group of emitters comprise first and second emitters emitting wavelengths of light at 460 nm and 530 nm, and said range of color temperatures is approximately 2700 to 6500K.

37. The luminaire of claim 21, further comprising a switching mechanism to switch the emission of said variable group of emitters on and off.

38. A method for varying the emission from a luminaire, comprising:

providing emission from a first source at a first color point within a standard deviation of the black body locus (BBL) on a CIE graph, said first source comprising first and second solid state emitters emitting at different wavelengths that combine to said color point; and

providing emission from a second source whose emission intensity is variable to vary the emission of said luminaire along a range of emissions all of which are within a standard deviation of said black body locus.

39. The method of claim 38, wherein said first source comprises first and second solid state emitters wherein said first solid state emitter emits light above the BBL in a CIE graph and said second solid state emitter is below the BBL, the emission from said first and second solid state emitters combining to said first color point.

40. The method of claim 38, wherein said first source comprises a blue shifted yellow (BSY) solid state emitter and a red emitting solid state emitter.

41. The method of claim 40, wherein the ratio of emission between said first and second solid state emitter remains approximately constant through emission variation of said second source.

42. The method of claim 38, wherein said second source comprises solid state emitter emitting at approximately the same wavelength.

43. The method of claim 38, wherein said second source comprises different types of emitters emitting at substantially different wavelengths of light.

44. The method of claim 38, wherein the second source emits light at a second color point that is to the left of said first color point on the CIE graph.

45. The method of claim 38, wherein said standard deviation is 0.01 delta u′

v′

of said BBL.

46. The method of claim 38, wherein said range of color temperatures is at least 2700 to 4000K.

47. A light engine, comprising:

a first group of solid state emitters comprising a first emitter emitting above the black body locus (BBL) in a CIE diagram, and a second emitter emitting below the BBL, the combination light from said first and second emitters generating an emission color point within a standard deviation of said BBL; and

a second group of solid state emitters, the combination of light from said first and second groups of emitters causing emission within a standard deviation of the black body locus (BBL), wherein varying the intensity of the second group of emitters causes emission from said first and second emitters to vary within a range of color temperatures while still emitting within said standard deviation of the BBL.

48. A light engine, comprising:

a blue shifted green (BSG) solid state emitter comprising a blue solid state emitter coated by a green phosphor, said green phosphor absorbing at least some of the blue light emitting from said blue solid state emitter and emitting green light; and

a red emitting solid state emitter, the combination of light from the BSG solid state emitter and red solid state emitter generating a light with a color point within a standard deviation of the black body locus (BBL) of a CIE diagram.

49. The light engine of claim 48, wherein said BSG solid state emitter emits light having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by color space defined by a plurality of line segments that connect a first point having x, y coordinates of 0.13,0.26, second point having x, y coordinates of 0.15, 0.20, third point having x, y coordinates of 0.35, 0.48, fourth point having x, y coordinates of 0.26, 0.50, and fifth point having x, y coordinates of 0.26, 0.28.

50. The light engine of claim 49, wherein said standard deviation comprises a ten step Macadam ellipse.

51. The light engine of claim 49, wherein said standard deviation comprises a four step Macadam ellipse.

52. The light engine of claim 49, wherein said red emitter emits light within the wavelength range of 600 to 660 nm.

53. The light engine of claim 49, wherein said red emitter emits light within the wavelength range of 605 to 625 nm.

54. The light engine of claim 49, having a CRI Ra of greater than or equal to 90 and a correlated color temperature in the range of 3500 to 15,000K.

55. The light engine of claim 49, having a CRI Ra of greater than or equal to 75 and a correlated color temperature in the range of 2500 to 20,000K.

56. The light engine of claim 49, further comprising a variable solid state emitter whose emission intensity can be varied to vary the combined emission of said BSG solid state emitters and red solid state emitters, said variable emitter along a range of color temperatures while maintaining said emission within a standard deviation of said BBL.

57. A solid state luminaire comprising:

a control group of solid state emitters comprising a blue shifted green (BSG) solid state emitter and a red solid state emitter; and

a variable group of solid state emitters, the combination of light from said control and variable groups causing emission within a standard deviation of the black body locus (BBL) in a CIE graph, the varying of emission intensity of said variable group of emitters causing the emission of the combined light from said control and variable emitters to vary within a range of color temperatures while emitting within said standard deviation of the BBL.

58. The solid state luminaire of claim 57, wherein said BSG solid state emitter emits light having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by color space defined by a plurality of line segments that connect a first point having x, y coordinates of 0.13, 0.26, second point having x, y coordinates of 0.15, 0.20, third point having x, y coordinates of 0.35, 0.48, fourth point having x, y coordinates of 0.26, 0.50, and fifth point having x, y coordinates of 0.26, 0.28.

59. The solid state luminaire of claim 57, wherein said red emitter emits light within the wavelength range of 600 to 660 nm.

60. A solid state luminaire comprising:

a control group of solid state emitters; and

a variable group of solid state emitters comprising blue shifted green (BSG) solid state emitters, the combination of light from said control and variable groups causing emission within a standard deviation of the black body locus (BBL) in a CIE graph, the varying of emission intensity of said variable group of emitters causing the emission of the combined light from said control and variable emitters to vary within a range of color temperatures while emitting within said standard deviation of the BBL.

61. The solid state luminaire of claim 60, wherein said BSG solid state emitters emits light having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by color space defined by a plurality of line segments that connect a first point having x, y coordinates of 0.13, 0.26, second point having x, y coordinates of 0.15, 0.20, third point having x, y coordinates of 0.35, 0.48, fourth point having x, y coordinates of 0.26, 0.50, and fifth point having x, y coordinates of 0.26, 0.28.