LIGHTING DEVICE AND LIGHTING METHOD

• US 20080106895A1
• Filed: 11/07/2007
• Published: 05/08/2008
• Est. Priority Date: 11/07/2006
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: LED Lighting Fixtures, Inc. (Wolfspeed, Inc.)
• Inventors: Van De Ven, Antony Paul, Negley, Gerald H.
• Granted Patent: US 8,029,155 B2
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: F21K 9/62 using mixing chambers, e.g. housings with reflective walls

Abstract

There is provided a lighting device comprising one or more groups of solid state light emitters and one or more groups of lumiphors, which emits mixed illumination having x, y color coordinates within a region defined by (0.32, 0.40), (0.36, 0.38), (0.41, 0.455), and (0.36, 0.48). Also, such lighting devices which emit light having x, y color coordinates within other specified regions. Also, such lighting devices with respective groups which emit light within two specified regions, and which mix to produce light within such regions. Also, methods of lighting light from such emitters and/or lumiphors.

Claims

1. A lighting device comprising:

a first group of solid state light emitters; and

a first group of lumiphors;

wherein;

if each of said first group of solid state light emitters is illuminated and each of said first group of lumiphors is excited, a mixture of light emitted from said first group of solid state light emitters and said first group of lumiphors would, in the absence of any additional light, have a first group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third and fourth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.38, said third point having x, y coordinates of 0.41, 0.455, and said fourth point having x, y coordinates of 0.36, 0.48.

2. A lighting device as recited in claim 1, wherein:

each of said first group of solid state light emitters, if illuminated, would emit light having a peak wavelength in the range of from 430 nm to 480 nm;

each of said first group of lumiphors, if excited, would emit light having a dominant wavelength in the range of from about 555 nm to about 585 nm.

3. A lighting device as recited in claim 2, wherein:

said first group of solid state light emitters comprises all of the solid state light emitters in said lighting device which, if illuminated, would emit light having a peak wavelength in the range of from about 430 nm to about 480 nm; and

said first group of lumiphors comprises all of the lumiphors in said lighting device which, if excited, would emit light having a dominant wavelength in the range of from about 555 nm to about 585 nm.

4. A lighting device as recited in claim 1, further comprising at least one power line, said first group of solid state light emitters comprising all solid state light emitters which, if illuminated, would emit light having a peak wavelength in the range of from 430 nm to 480 nm, and wherein each of said first group of solid state light emitters is illuminated if power is supplied to said at least one power line.

5. A lighting device as recited in claim 4, wherein said first group of lumiphors comprises all of the lumiphors in said lighting device which, if excited, would emit light having a dominant wavelength in the range of from about 555 nm to about 585 nm, and each of said first group of lumiphors is illuminated if power is supplied to said at least one power line.

6. A lighting device as recited in claim 1, wherein if every solid state light emitter in said lighting device is illuminated, said lighting device would emit light having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third and fourth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.38, said third point having x, y coordinates of 0.41, 0.455, and said fourth point having x, y coordinates of 0.36, 0.48.

7. A lighting device as recited in claim 1, wherein said lighting device further comprises at least one power line, and if power is supplied to each of said at least one power line, said lighting device would emit light having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third and fourth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.38, said third point having x, y coordinates of 0.41, 0.455, and said fourth point having x, y coordinates of 0.36, 0.48.

8. A lighting device as recited in claim 1, wherein said lighting device further comprises a second group of solid state light emitters, said second group of solid state light emitters comprising at least one second group solid state light emitter, wherein each said second group solid state light emitter, if illuminated, would emit saturated light.

9. A lighting device comprising:

a first group of solid state light emitters; and

a first group of lumiphors;

wherein;

if each of said first group of solid state light emitters is illuminated and each of said first group of lumiphors is excited, a mixture of light emitted from said first group of solid state light emitters and said first group of lumiphors would, in the absence of any additional light, have a first group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third and fourth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to said first point, said first point, having x, y coordinates of 0.36, 0.48, said second point having x, y coordinates of 0.43, 0.45, said third point having x, y coordinates of 0.5125, 0.4866, and said fourth point having x, y coordinates of 0.4087, 0.5896.

10. A lighting device as recited in claim 9, further comprising at least one power line, said first group of solid state light emitters comprising all solid state light emitters which, if illuminated, would emit light having a peak wavelength in the range of from 430 nm to 480 nm, and wherein each of said first group of solid state light emitters is illuminated if power is supplied to said at least one power line.

11. A lighting device as recited in claim 10, wherein said first group of lumiphors comprises all of the lumiphors in said lighting device which, if excited, would emit light having a dominant wavelength in the range of from about 555 nm to about 585 nm, and each of said first group of lumiphors is illuminated if power is supplied to said at least one power line.

12. A lighting device comprising:

a first group of solid state light emitters; and

a first group of lumiphors;

wherein;

if each of said first group of solid state light emitters is illuminated and each of said first group of lumiphors is excited, a mixture of light emitted from said first group of solid state light emitters and said first group of lumiphors would, in the absence of any additional light, have a first group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third and fourth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to said first point, said first point having x, y coordinates of 0.41, 0.455 said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.4087, 0.5896, and said fourth point having x, y coordinates of 0.4788, 0.5202.

13. A lighting device as recited in claim 12, further comprising at least one power line, said first group of solid state light emitters comprising all solid state light emitters which, if illuminated, would emit light having a peak wavelength in the range of from 430 nm to 480 nm, and wherein each of said first group of solid state light emitters is illuminated if power is supplied to said at least one power line.

14. A lighting device comprising:

a first group of solid state light emitters;

a first group of lumiphors;

a second group of solid state light emitters; and

a second group of lumiphors;

wherein;

if each of said first group of solid state light emitters is illuminated and each of said first group of lumiphors is excited, a mixture of light emitted from said first group of solid state light emitters and said first group of lumiphors would, in the absence of any additional light, have a first group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third and fourth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, and said fourth line segment connecting said fourth point to said first point, said first point having x, y coordinates of 0.36, 0.48, said second point having x, y coordinates of 0.43, 0.45, said third point having x, y coordinates of 0.5125, 0.4866, and said fourth point having x, y coordinates of 0.4087, 0.5896;

if each of said second group of solid state light emitters is illuminated and each of said second group of lumiphors is excited, a mixture of light emitted from said second group of solid state light emitters and said second group of lumiphors would, in the absence of any additional light, have a second group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by fifth, sixth, seventh and eighth line segments, said fifth line segment connecting a fifth point to a sixth point, said sixth line segment connecting said sixth point to a seventh point, said seventh line segment connecting said seventh point to an eighth point, and said eighth line segment connecting said eighth point to said fifth point, said fifth point having x, y coordinates of 0.32, 0.40, said sixth point having x, y coordinates of 0.36, 0.38, said seventh point having x, y coordinates of 0.30, 0.26, and said eighth point having x, y coordinates of 0.25, 0.29;

if each of said first group of solid state light emitters and said second group of solid state light emitters is illuminated and each of said first group of lumiphors and said second group of lumiphors is excited, a mixture of light emitted from said first group of solid state light emitters, said second group of solid state light emitters, said first group of lumiphors and said second group of lumiphors would, in the absence of any additional light, have a first group-second group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by ninth, tenth, eleventh, twelfth and thirteenth line segments, said ninth line segment connecting a ninth point to a tenth point, said tenth line segment connecting said tenth point to an eleventh point, said eleventh line segment connecting said eleventh point to a twelfth point, said twelfth line segment connecting said twelfth point to a thirteenth point, and said thirteenth line segment connecting said thirteenth point to said ninth point, said ninth point having x, y coordinates of 0.32, 0.40, said tenth point having x, y coordinates of 0.36, 0.48, said eleventh point having x, y coordinates of 0.43, 0.45, said twelfth point having x, y coordinates of 0.42, 0.42, and said thirteenth point having x, y coordinates of 0.36, 0.38.

15. A lighting device as recited in claim 14, wherein:

each of said first group of solid state light emitters and said second group of solid state light emitters, if illuminated, would emit light having a peak wavelength in the range of from 430 nm to 480 nm;

each of said first group of lumiphors and said second group of lumiphors, if excited, would emit light having a dominant wavelength in the range of from about 555 nm to about 585 nm.

16. A lighting device as recited in claim 14, further comprising at least one power line, said first and second groups of solid state light emitters together comprising all solid state light emitters which, if illuminated, would emit light having a peak wavelength in the range of from 430 nm to 480 nm, and wherein each of said first and second groups of solid state light emitters are illuminated if power is supplied to said at least one power line.

17. A lighting device as recited in claim 16, wherein said first and second groups of lumiphors together comprise all of the lumiphors in said lighting device which, if excited, would emit light having a dominant wavelength in the range of from about 555 nm to about 585 nm, and each of said first and second groups of lumiphors is illuminated if power is supplied to said at least one power line.

18. A lighting device as recited in claim 14, wherein if every LED in said lighting device is illuminated, said lighting device would emit light having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third, fourth and fifth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to said fifth point, said fifth line segment connecting said fifth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.43, 0.45, said fourth point having x, y coordinates of 0.42, 0.42, and said fifth point having x, y coordinates of 0.36, 0.38.

19. A lighting device as recited in claim 14, wherein said lighting device further comprises at least one power line, and if power is supplied to each of said at least one power line, said lighting device would emit light having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by enclosed by first, second, third, fourth and fifth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to said fifth point, said fifth line segment connecting said fifth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.43, 0.45, said fourth point having x, y coordinates of 0.42, 0.42, and said fifth point having x, y coordinates of 0.36, 0.38.

20. A lighting device comprising:

a first group of solid state light emitters;

a first group of lumiphors;

a second group of solid state light emitters; and

a second group of lumiphors;

wherein;

if each of said first group of solid state light emitters is illuminated and each of said first group of lumiphors is excited, a mixture of light emitted from said first group of solid state light emitters and said first group of lumiphors would, in the absence of any additional light, have a first group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third and fourth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, and said fourth line segment connecting said fourth point to said first point, said first point having x, y;

coordinates of 0.41, 0.455 said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.4087, 0.5896, and said fourth point having x, y coordinates of 0.4788, 0.5202;

if each of said second group of solid state light emitters is illuminated and each of said second group of lumiphors is excited, a mixture of light emitted from said second group of solid state light emitters and said second group of lumiphors would, in the absence of any additional light, have a second group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by fifth, sixth, seventh and eighth line segments, said fifth line segment connecting a fifth point to a sixth point, said sixth line segment connecting said sixth point to a seventh point, said seventh line segment connecting said seventh point to an eighth point, and said eighth line segment connecting said eighth point to said fifth point, said fifth point having x, y coordinates of 0.32, 0.40, said sixth point having x, y coordinates of 0.36, 0.38, said seventh point having x, y coordinates of 0.30, 0.26, and said eighth point having x, y coordinates of 0.25, 0.29;

if each of said first group of solid state light emitters and said second group of solid state light emitters is illuminated and each of said first group of lumiphors and said second group of lumiphors is excited, a mixture of light emitted from said first group of solid state light emitters, said second group of solid state light emitters, said first group of lumiphors and said second group of lumiphors would, in the absence of any additional light, have a first group-second group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by ninth, tenth, eleventh and twelfth line segments, said ninth line segment connecting a ninth point to a tenth point, said tenth line segment connecting said tenth point to an eleventh point, said eleventh line segment connecting said eleventh point to a twelfth point, said twelfth line segment connecting said twelfth point to said ninth point, said ninth point having x,y coordinates of 0.32, 0.40, said tenth point having x, y coordinates of 0.36, 0.38, said eleventh point having x, y coordinates of 0.41, 0.455, and said twelfth point having x, y coordinates of 0.36, 0.48.

21. A lighting device as recited in claim 20, wherein:

each of said first group of solid state light emitters and said second group of solid state light emitters, if illuminated, would emit light having a peak wavelength in the range of from 430 nm to 480 nm;

each of said first group of lumiphors and said second group of lumiphors, if excited, would emit light having a dominant wavelength in the range of from about 555 nm to about 585 nm.

22. A lighting device as recited in claim 20, further comprising at least one power line, said first and second groups of solid state light emitters together comprising all solid state light emitters which, if illuminated, would emit light having a peak wavelength in the range of from 430 nm to 480 nm, and wherein each of said first and second groups of solid state light emitters is illuminated if power is supplied to said at least one power line.

23. A lighting device as recited in claim 22, wherein said first and second groups of lumiphors together comprise all of the lumiphors in said lighting device which, if excited, would emit light having a dominant wavelength in the range of from about 555 nm to about 585 nm, and each of said first and second groups of lumiphors is illuminated if power is supplied to said at least one power line.

24. A lighting device as recited in claim 20, wherein if every LED in said lighting device is illuminated, said lighting device would emit light having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third and fourth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.38, said third point having x, y coordinates of 0.41, 0.455, and said fourth point having x, y coordinates of 0.36, 0.48.

25. A lighting device as recited in claim 20, wherein said lighting device further comprises at least one power line, and if power is supplied to each of said at least one power line, said lighting device would emit light having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third and fourth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.38, said third point having x, y coordinates of 0.41, 0.455, and said fourth point having x, y coordinates of 0.36, 0.48.

26. A method of lighting, comprising:

mixing light from a first group of at least one solid state light emitter and light from a first group of at least one lumiphor to form first group mixed illumination;

said first group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third and fourth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.38, said third point having x,,y coordinates of 0.41, 0.455, and said fourth point having x, y coordinates of 0.36, 0.48.

27. A method as recited in claim 26, wherein:

said light from each of said first group of at least one solid state light emitter has a peak wavelength in the range of from 430 nm to 480 nm; and

said light from each of said first group of at least one lumiphor has a dominant wavelength in the range of from 555 nm to 585 nm.

28. A method of lighting, comprising:

mixing light from a first group of at least one solid state light emitter and light from a first group of at least one lumiphor to form first group mixed illumination;

said first group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third and fourth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to said first point, said first point having x, y coordinates of 0.36, 0.48, said second point having x, y coordinates of 0.43, 0.45, said third point having x, y coordinates of 0.5125, 0.4866, and said fourth point having x, y coordinates of 0.4087, 0.5896.

29. A method as recited in claim 28, wherein:

said light from each of said first group of at least one solid state light emitter has a peak wavelength in the range of from 430 nm to 480 nm; and

said light from each of said first group of at least one lumiphor has a dominant wavelength in the range of from 555 nm to 585 nm.

30. A method of lighting, comprising:

mixing light from a first group of at least one solid state light emitter and light from a first group of at least one lumiphor to form first group mixed illumination;

said first group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third and fourth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to said first point, said first point having x, y coordinates of 0.41, 0.455 said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.4087, 0.5896, and said fourth point having x, y coordinates of 0.4788, 0.5202.

31. A method as recited in claim 30, wherein:

said light from each of said first group of at least one solid state light emitter has a peak wavelength in the range of from 430 nm to 480 nm; and

said light from each of said first group of at least one lumiphor has a dominant wavelength in the range of from 555 nm to 585 nm.

32. A method of lighting, comprising:

mixing light from a first group of at least one solid state light emitter, light from a second group of at least one solid state light emitter, light from a first group of at least one lumiphor and light from a second group of at least one lumiphor to form first group-second group mixed illumination;

said first group-second group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by ninth, tenth, eleventh, twelfth and thirteenth line segments, said ninth line segment connecting a ninth point to a tenth point, said tenth line segment connecting said tenth point to an eleventh point, said eleventh line segment connecting said eleventh point to a twelfth point, said twelfth line segment connecting said twelfth point to a thirteenth point, and said thirteenth line segment connecting said thirteenth point to said ninth point, said ninth point having x, y coordinates of 0.32, 0.40, said tenth point having x, y coordinates of 0.36, 0.48, said eleventh point having x, y coordinates of 0.43, 0.45, said twelfth point having x, y coordinates of 0.42, 0.42, and said thirteenth point having x, y coordinates of 0.36, 0.38,

wherein;

a mixture of light emitted from said first group of solid state light emitters and said first group of lumiphors would, in the absence of any additional light, have a first group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third and fourth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, and said fourth line segment connecting said fourth point to said first point, said first point having x, y coordinates of 0.36, 0.48, said second point having x, y coordinates of 0.43, 0.45, said third point having x, y coordinates of 0.5125, 0.4866, and said fourth point having x, y coordinates of 0.4087, 0.5896, and

a mixture of light emitted from said second group of solid state light emitters and said second group of lumiphors would, in the absence of any additional light, have a second group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by fifth, sixth, seventh and eighth line segments, said fifth line segment connecting a fifth point to a sixth point, said sixth line segment connecting said sixth point to a seventh point, said seventh line segment connecting said seventh point to an eighth point, and said eighth line segment connecting said eighth point to said fifth point, said fifth point having x, y coordinates of 0.32, 0.40, said sixth point having x, y coordinates of 0.36, 0.38, said seventh point having x, y coordinates of 0.30, 0.26, and said eighth point having x, y coordinates of 0.25, 0.29.

33. A method as recited in claim 32, wherein:

said light from each of said first group of at least one solid state light emitter and each of said second group of at least one solid state light emitter has a peak wavelength in the range of from 430 nm to 480 nm; and

said light from each of said first group of at least one lumiphor and each of said second group of at least one lumiphor has a dominant wavelength in the range of from 555 nm to 585 nm.

34. A method of lighting, comprising:

mixing light from a first group of at least one solid state light emitter, light from a second group of at least one solid state light emitter, light from a first group of at least one lumiphor and light from a second group of at least one lumiphor to form first group-second group mixed illumination;

said first group-second group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by ninth, tenth, eleventh and twelfth line segments, said ninth line segment connecting a ninth point to a tenth point, said tenth line segment connecting said tenth point to an eleventh point, said eleventh line segment connecting said eleventh point to a twelfth point, said twelfth line segment connecting said twelfth point to said ninth point, said ninth point having x, y coordinates of 0.32, 0.40, said tenth point having x, y coordinates of 0.36, 0.38, said eleventh point having x, y coordinates of 0.41, 0.455, and said twelfth point having x, y coordinates of 0.36, 0.48,

wherein;

a mixture of light emitted from said first group of solid state light emitters and said first group of lumiphors would, in the absence of any additional light, have a first group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third and fourth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, and said fourth line segment connecting said fourth point to said first point, said first point having x, y coordinates of 0.41, 0.455 said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.4087, 0.5896, and said fourth point having x, y coordinates of 0.4788, 0.5202, and

a mixture of light emitted from said second group of solid state light emitters and said second group of lumiphors would, in the absence of any additional light, have a second group mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by fifth, sixth, seventh and eighth line segments, said fifth line segment connecting a fifth point to a sixth point, said sixth line segment connecting said sixth point to a seventh point, said seventh line segment connecting said seventh point to an eighth point, and said eighth line segment connecting said eighth point to said fifth point, said fifth point having x, y coordinates of 0.32, 0.40, said sixth point having x, y coordinates of 0.36, 0.38, said seventh point having x, y coordinates of 0.30, 0.26, and said eighth point having x, y coordinates of 0.25, 0.29.

35. A method as recited in claim 34, wherein:

said light from each of said first group of at least one solid state light emitter and each of said second group of at least one solid state light emitter has a peak wavelength in the range of from 430 nm to 480 nm; and

said light from each of said first group of at least one lumiphor and each of said second group of at least one lumiphor has a dominant wavelength in the range of from 555 nm to 585 nm.