LIGHTING DEVICE AND LIGHTING METHOD

• US 20100254130A1
• Filed: 06/15/2010
• Published: 10/07/2010
• Est. Priority Date: 12/21/2005
• Status: Abandoned Application

• Current Assignee: Cree Lighting Company (Ideal Industries Incorporated)
• Original Assignee: Cree Lighting Company (Ideal Industries Incorporated)
• Inventors: VAN DE VEN, Antony Paul, Negley, Gerald H.
• Application Number:
  US12/815,846
• Publication Number:
  US 20100254130A1
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

A lighting device comprising sources of visible light comprising solid state light emitters and/or luminescent materials emitting three or four different hues. A first group of the sources, when illuminated, emit light of two hues which, if combined, would produce illumination having coordinates within an area on a 1931 CIE Chromaticity Diagram defined by points having coordinates: 0.59, 0.24; 0.40, 0.50; 0.24, 0.53; 0.17, 0.25; and 0.30, 0.12. A second group of the sources is of an additional hue. Mixing light from the first and second groups produces illumination within ten MacAdam ellipses of the blackbody locus. Also, a lighting device comprising a white light source having a CRI of 75 or less and at least one solid state light emitters and/or luminescent material. Also, methods of lighting.

Claims

1. A lighting device comprising:

at least one white light source having a CRI of 75 or less, and

at least one additional source of visible light comprising at least one additional source of visible light of a first additional hue, said at least one additional source of visible light being selected from among solid state light emitters and luminescent materials,

wherein mixing of light from said white light source and light from said at least one additional source of visible light produces a mixed illumination which has a CRI of greater than 75.

2. A lighting device as recited in claim 1, wherein said mixed illumination has a CRI of at least 85.

3. A lighting device as recited in claim 1, wherein said mixed illumination has a CRI of at least 90.

4. A lighting device as recited in claim 1, wherein a combined intensity of said light from said at least one white light source is at least 50% of an intensity of said mixed illumination.

5. A lighting device as recited in claim 1, wherein a combined intensity of said light from said at least one white light source is at least 75% of an intensity of said mixed illumination.

6. A lighting device as recited in claim 1, wherein said at least one additional source of visible light is a solid state light emitter.

7. A lighting device as recited in claim 1, wherein said at least one additional source of visible light is a light emitting diode.

8. A lighting device as recited in claim 1, wherein said at least one additional source of visible light is a luminescent material.

9. A lighting device as recited in claim 1, wherein said at least one additional source of visible light is a phosphor.

10. A lighting device as recited in claim 1, wherein said at least one additional source of visible light is saturated.

11. A lighting device comprising:

at least one white light source having a CRI of 75 or less, and

additional sources of visible light comprising at least one additional source of visible light of a first additional hue and at least one additional source of visible light of a second additional hue, said additional sources of visible light being selected from among solid state light emitters and luminescent materials,

wherein mixing of light from said white light source and light from said additional sources of visible light produces a mixed illumination which has a CRI of greater than 75.

12. A lighting device as recited in claim 11, wherein said mixed illumination has a CRI of at least 85.

13. A lighting device as recited in claim 11, wherein said mixed illumination has a CRI of at least 90.

14. A lighting device as recited in claim 11, wherein a combined intensity of said light from said at least one white light source is at least 50% of an intensity of said mixed illumination.

15. A lighting device as recited in claim 11, wherein a combined intensity of said light from said at least one white light source is at least 75% of an intensity of said mixed illumination.

16. A lighting device as recited in claim 11, wherein said at least one additional source of visible light is a solid state light emitter.

17. A lighting device as recited in claim 11, wherein said at least one additional source of visible light is a light emitting diode.

18. A lighting device as recited in claim 11, wherein said at least one additional source of visible light is a luminescent material.

19. A lighting device as recited in claim 11, wherein said at least one additional source of visible light is a phosphor.

20. A lighting device as recited in claim 11, wherein said at least one additional source of visible light is saturated.

21. A method of lighting, comprising:

mixing light from a white light source having a CRI of 75 or less, and

light from at least one additional source of visible light comprising at least one additional source of visible light of a first additional hue, said at least one additional source of visible light being selected from among solid state light emitters and luminescent materials, wherein mixing of light from said white light source and light from said at least one additional source of visible light produces a mixed illumination which has a CRI of greater than 75.

22. A method as recited in claim 21, wherein said mixed illumination has a CRI of at least 85.

23. A method as recited in claim 21, wherein said mixed illumination has a CRI of at least 90.

24. A method as recited in claim 21, wherein a combined intensity of said light from said at least one white light source is at least 50% of an intensity of said mixed illumination.

25. A method as recited in claim 21, wherein a combined intensity of said light from said at least one white light source is at least 75% of an intensity of said mixed illumination.

26. A method as recited in claim 21, wherein said at least one additional source of visible light is a solid state light emitter.

27. A method as recited in claim 21, wherein said at least one additional source of visible light is a light emitting diode.

28. A method as recited in claim 21, wherein said at least one additional source of visible light is a luminescent material.

29. A method as recited in claim 21, wherein said at least one additional source of visible light is a phosphor.

30. A method as recited in claim 21, wherein said at least one additional source of visible light is saturated.

31. A method of lighting, comprising:

mixing light from a white light source having a CRI of 75 or less, and

light from additional sources of visible light comprising at least one additional source of visible light of a first additional hue and at least one additional source of visible light of a second additional hue, said additional sources of visible light being selected from among solid state light emitters and luminescent materials,

wherein mixing of light from said white light source and light from said additional sources of visible light produces a mixed illumination which has a CRI of greater than 75.

32. A method as recited in claim 31, wherein said mixed illumination has a CRI of at least 85.

33. A method as recited in claim 31, wherein said mixed illumination has a CRI of at least 90.

34. A method as recited in claim 31, wherein a combined intensity of said light from said at least one white light source is at least 50% of an intensity of said mixed illumination.

35. A method as recited in claim 31, wherein a combined intensity of said light from said at least one white light source is at least 75% of an intensity of said mixed illumination.

36. A method as recited in claim 31, wherein said at least one additional source of visible light is a solid state light emitter.

37. A method as recited in claim 31, wherein said at least one additional source of visible light is a light emitting diode.

38. A method as recited in claim 31, wherein said at least one additional source of visible light is a luminescent material.

39. A method as recited in claim 31, wherein said at least one additional source of visible light is a phosphor.

40. A method as recited in claim 31, wherein said at least one additional source of visible light is saturated.