Solid state light source emitting warm light with high CRI

• US 9,599,291 B2
• Filed: 02/24/2014
• Issued: 03/21/2017
• Est. Priority Date: 06/04/2010
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Van De Ven, Antony, Negley, Gerald, Pickard, Paul Kenneth
• Primary Examiner(s): Truong, Bao Q
• Application Number:
  US14/188,094
• Publication Number:
  US 20140168989A1
• Time in Patent Office: 1,121 Days
• US Class Current: 1/1
• CPC Class Codes: F21K 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• 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: F21V 11/06 using crossed laminae or strips , e.g. grid-shaped louvers; using lattices or honeycombs
• CPC Class Codes: F21V 13/04 the elements being reflectors and refractors for vehicle rear lights F21S43/40
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 13/14 the elements being filters or photoluminescent elements, reflectors and refractors
• CPC Class Codes: F21V 31/04 Provision of filling media
• CPC Class Codes: F21V 7/0025 Combination of two or more reflectors for a single light source array of reflectors for a cluster of light sources F21V7/0083
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: F21V 9/20 Dichroic filters, i.e. devices operating on the principle of wave interference to pass specific ranges of wavelengths while cancelling others
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 5/20 Filters polarising elements G02B5/30
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

Solid state light sources, lighting devices and lamps arranged to provide emission with a warm temperature and high CRI. One embodiment of a solid state lighting device according to the present invention comprises a light emitting diode (LED) device capable of emitting light in an emission spectrum. A filter arranged so that at least some light from the LED light source passes through it, with the filter filtering at least some of one or more portions of the light source emission spectrum. The resulting light source light has a different temperature but substantially the same CRI after passing through the filter.

Claims

1. A light emitting diode (LED) lamp comprising:

a LED light source configured to generate light emissions comprising an emission spectrum;

a lamp opening configured to transmit at least a portion of the emission spectrum generated by the LED light source; and

a filter configured to filter at least a portion of the emission spectrum

wherein the light emitted from the LED light source has a color temperature of 2700K or higher, and wherein the filtered LED light source light has a color temperature of 2500K or lower.

2. The LED lamp of claim 1, wherein said filter filters at least some of the emission spectrum.

3. The LED lamp of claim 1, wherein the LED light has a different color temperature but substantially the same CRI after passing through said filter.

4. The LED lamp of claim 1, wherein the filter filters at least some of one or more portions of said emission spectrum.

5. The LED lamp of claim 1, wherein said lamp opening is in a lamp housing and wherein the filter is mounted to the inside of said housing.

6. The LED lamp of claim 1, wherein said filter comprises a dome at least partially covering said LED light source.

7. The LED lamp of claim 1, wherein said LED light source light has a color temperature of 1700K or higher after passing through said filter.

8. The LED lamp of claim 1, wherein the color rendering index (CRI) of the LED light source light after passing through the filter is 70% or more of the CRI of said LED light source light before filtering.

9. The LED lamp of claim 1, wherein the color rendering index (CRI) of the LED light source light after passing through the filter is 90% or more of the CRI of said LED light source light before filtering.

10. The LED lamp of claim 1, wherein said CRI of the LED light source light is 80 or more after passing through said filter.

11. The LED lamp of claim 1, wherein said light source light has a color temperature of 2000K or higher after passing through said filter.

12. The LED lamp of claim 1, wherein a color point of the light emitted from the LED light source is within 7 MacAdam ellipses of the black body locus and where a color point of the filtered LED light source light is also within 7 MacAdam ellipses of the black body locus.

13. The LED lamp of claim 1, wherein a color point of the light emitted from the LED light source is within 3 MacAdam ellipses of the black body locus and where a color point of the filtered LED light source light is also within 3 MacAdam ellipses of the black body locus.

14. The LED lamp of claim 1, wherein said emission spectrum comprises a blue portion and a green/yellow portion, said filter filtering at least some of a blue portion of said emission spectrum and at least some of a green/yellow portion of said spectrum.

15. The LED lamp of claim 14, wherein said filtered LED light source light has a lower color temperature but substantially the same CRI after passing through said filter.

16. The LED lamp of claim 14, wherein said filter filters approximately 40% of said blue portion and approximately 20% of said green/yellow portion.

17. The LED lamp of claim 14, wherein said filter filters approximately 90% of said blue portion and approximately 45% of said green/yellow portion.

18. A light emitting diode (LED) lamp comprising:

a LED light source configured to generate light emissions comprising an emission spectrum;

a lens positioned such that at least a portion of said LED light emissions passes through said lens; and

a filter adjacent to said lens to filter at least a portion of the emission spectrum;

wherein said filter is fixed in place with respect to said lens;

wherein the light emitted from the LED light source has a color temperature of 2700K or higher, and wherein the filtered LED light source light has a color temperature of 2500K or lower;

wherein the filter comprises at least one of the following characteristics (a) and (b);

(a) the filter covers less than the entire lens so that at least a portion of said light emissions are transmitted from said lamp without passing through the filter; and

(b) the filter comprises different filtering characteristics in different regions.

19. The LED lamp of claim 18, wherein said filter provides different filtering characteristics in different areas of a beam emitted by the LED lamp.

20. A light emitting diode (LED) lamp comprising:

a LED light source configured to generate light emissions comprising an emission spectrum;

a lamp housing defining an opening configured to transmit at least a portion of the emission spectrum generated by the LED light source; and

a filter configured to filter at least a portion of the emission spectrum;

wherein said filter is fixedly connected to said lamp housing at said opening;

wherein the light emitted from the LED light source has a color temperature of 2700K or higher, and wherein the filtered LED light source light has a color temperature of 2500K or lower; and

wherein said filter is non-uniform with respect to position and provides different filtering characteristics in different regions of a beam emitted by the LED light source.

21. The LED lamp of claim 20, wherein the LED light has a different color temperature but substantially the same CRI after passing through said filter.

22. The LED lamp of claim 20, wherein said filter is mounted to the inside of said lamp housing.

23. The LED lamp of claim 20, wherein said LED light source light has a color temperature of 1700K or higher after passing through said filter.

24. The LED lamp of claim 20, wherein the color rendering index (CRI) of the LED light source light after passing through the filter is 70% or more of the CRI of said LED light source light before filtering.

25. The LED lamp of claim 20, wherein the color rendering index (CRI) of the LED light source light after passing through the filter is 90% or more of the CRI of said LED light source light before filtering.

26. The LED lamp of claim 20, wherein said CRI of the LED light source light is 80 or more after passing through said filter.

27. The LED lamp of claim 20, wherein said light source light has a color temperature of 2000K or higher after passing through said filter.

28. The LED lamp of claim 20, wherein a color point of the light emitted from the LED light source is within 7 MacAdam ellipses of the black body locus and where a color point of the filtered LED light source light is also within 7 MacAdam ellipses of the black body locus.

29. The LED lamp of claim 20, wherein a color point of the light emitted from the LED light source is within 3 MacAdam ellipses of the black body locus and where a color point of the filtered LED light source light is also within 3 MacAdam ellipses of the black body locus.

30. The LED lamp of claim 20, wherein said emission spectrum comprises a blue portion and a green/yellow portion, said filter filtering at least some of a blue portion of said emission spectrum and at least some of a green/yellow portion of said spectrum.

31. The LED lamp of claim 30, wherein said filtered LED light source light has a lower color temperature but substantially the same CRI after passing through said filter.

32. The LED lamp of claim 20, wherein said filter comprises a dichroic filter that at least partially reflects blue light to a phosphor.

33. The LED lamp of claim 32, wherein said phosphor at least partially covers said LED light source.