HIGH CRI ADJUSTABLE COLOR TEMPERATURE LIGHTING DEVICES

• US 20110148327A1
• Filed: 12/21/2009
• Published: 06/23/2011
• 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: Van de Ven, Antony P., Negley, Gerald
• Granted Patent: US 8,511,851 B2
• Time in Patent Office: Days
• US Class Current: 315/312
• 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; 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 control group of emitters comprises first and second LED chips emitting at different colors of light.

3. The luminaire of claim 2, wherein the emission point of said first light emitting LED chip is above the BBL in a CIE graph and the emission of said second LED chip is below the BBL.

4. The luminaire of claim 2, wherein said first LED chip comprises a blue shifted yellow (BSY) LED chip.

5. The luminaire of claim 2, wherein said second LED chip comprises a red emitting LED chip.

6. The luminaire of claim 2, wherein the ratio of emission between said first and second LED chip remains approximately constant when the emission from said variable emitters is varied.

7. The luminaire of claim 1, wherein said variable emitters comprise blue emitting LED chips.

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

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

10. The luminaire of claim 1, wherein said variable emitters comprise blue emitting LED chips and green emitting LED chips.

11. The luminaire of claim 1, wherein said variable emitters each comprise LED chips having a blue LED coated by a green phosphor.

12. The luminaire of claim 2, 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 LED chips.

13. 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.

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

v′

of said BBL.

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

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

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

18. 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.

19. 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.

20. 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.

21. 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.

51. The light engine of claim 1, wherein said BSG LED chip 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.

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

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

54. The light engine of claim 51, wherein said red emitter emits light within the wavelength range of 600 to 660 nm.

55. The light engine of claim 51, wherein said red emitter emits light within the wavelength range of 605 to 625 nm.

56. The light engine of claim 51, having a CRI Ra of greater than or equal to 90 and a correlated color temperature in the range of 3500 to 15,000K.

57. The light engine of claim 51, having a CRI Ra of greater than or equal to 75 and a correlated color temperature in the range of 2500 to 20,000K.

58. The light engine of claim 51, further comprising a variable LED chip 12 whose emission intensity can be varied to vary the combined emission of said BSY LED and red LED chips, said variable emitter along a range of color temperatures while maintaining said emission within a standard deviation of said BBL.

22. 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.

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

24. The luminaire of claim 22, wherein said first emitter comprises a blue shifted yellow (BSY) LED chip.

25. The luminaire of claim 22, wherein said second emitter comprises a red emitting LED chip.

26. The luminaire of claim 22, wherein the ratio of emission between said first and second LED chip remains approximately when the emission from said variable emitters is varied.

27. The luminaire of claim 22, wherein said variable emitters comprise blue emitting LED chips.

28. The luminaire of claim 22, wherein said variable emitters comprise different types of emitters emitting at different colors of light.

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

30. The luminaire of claim 22, wherein said variable emitters comprise blue emitting LED chips and green emitting LED chips.

31. The luminaire of claim 22, wherein said variable emitters each comprise LED chips having a blue LED coated by a green phosphor.

32. The luminaire of claim 22, 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.

33. The luminaire of claim 22, wherein said standard deviation is 0.01 delta u′

v′

of said BBL.

34. The luminaire of claim 22, 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.

35. The luminaire of claim 22, 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.

36. The luminaire of claim 22, 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.

37. The luminaire of claim 22, 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.

38. The luminaire of claim 22, further comprising a switching mechanism to switch the emission of said variable group of emitters on and off.

39. 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; 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.

40. The method of claim 39, wherein said first source comprises first and second LED chips emitting at different colors of light that combine to said color point.

41. The method of claim 39, wherein said first source comprises first and second light emitting (LED) chips wherein said first light emitting diode (LED) chip emits light above the BBL in a CIE graph and said second LED chip is below the BBL, the emission from said first and second LED chips combining to said color first color point.

42. The method of claim 39, wherein said first source comprises a blue shifted yellow (BSY) LED chip and a red emitting LED chip.

43. The method of claim 42, wherein the ratio of emission between said first and second LED chips remains approximately constant through emission variation of said second source.

44. The method of claim 39, wherein said second source comprises LED chips emitting at approximately the same wavelength.

45. The method of claim 39, wherein said second source comprises different types of emitters emitting at substantially different wavelengths of light.

46. The method of claim 39, 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.

47. The method of claim 39, wherein said standard deviation is 0.01 delta u′

v′

of said BBL.

48. The method of claim 39, wherein said range of color temperatures is at least 2700 to 4000K.

49. 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.

50. A light engine, comprising:

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

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

59. A solid state luminaire comprising:

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

60. The solid state luminaire of claim 59, wherein said BSG LED chip 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.

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

62. A solid state luminaire comprising:

a control group of solid state emitters; and

a variable group of solid state emitters comprising a blue shifted green (BSG) LED chips, 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.

63. The solid state luminaire of claim 62, wherein said BSG LED chips 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.