SOLID STATE LIGHT SOURCE EMITTING WARM LIGHT WITH HIGH CRI

• US 20140168989A1
• Filed: 02/24/2014
• Published: 06/19/2014
• 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
• Granted Patent: US 9,599,291 B2
• Time in Patent Office: Days
• US Class Current: 362/293
• 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 arranged to generate light emissions having an emission spectrum;

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

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

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

(a) the filter covers a portion but less than an entirety of the lamp opening so that at least a portion of the light emissions generated by the LED light source are transmitted through the opening without passage through the filter; and

(b) the filter is non-uniform with respect to position and provides different filtering characteristics in different regions of a beam emitted by the LED lamp.

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 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.

15. 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.

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

17. The LED lamp of claim 15, wherein said filter filters approximately 40% of said blue portion and approximately 20% of said green/yellow portion.

18. The LED lamp of claim 15, wherein said filter filters approximately 90% of said blue portion and approximately 45% of said green/yellow portion.

19. A light emitting diode (LED) lighting device comprising:

a LED light source arranged to generate light emissions having an emission spectrum; and

a filter arranged in a domed or dome-like shape to cover less than an entirety of the LED light source and arranged to filter at least a portion of the emission spectrum, wherein at least a portion of the light emissions generated by the LED light source exit the lighting device without passage through the filter.

20. The LED lamp of claim 19, 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.

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

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

23. The LED lamp of claim 22, wherein said filtered light has a color temperature that is approximately 2400K or greater.

24. The LED lamp of claim 22, wherein said filtered light has a CRI that is 90 or greater.

25. The LED lamp of claim 20, wherein said filter filters approximately 90% of said blue portion and approximately 45% of said green/yellow portion.

26. The LED lamp of claim 25, wherein said filtered light has a color temperature that is approximately 1800K or greater.

27. The LED lamp of claim 25, wherein said filtered light has a CRI that is 89 or greater.

28. The LED lamp of claim 19, wherein both a color point of the light emitted from the LED light source and a color point of the filtered LED light source light are within 7 MacAdam ellipses of the black body locus.

29. The LED lamp of claim 19, wherein both a color point of the light emitted from the LED light source and a color point of the filtered LED light source light are within 3 MacAdam ellipses of the black body locus.

30. The LED lamp of claim 19, 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.

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

a LED light source generating light emissions having an emission spectrum;

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

and

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

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 has different filtering characteristics in different regions.

32. The LED lamp of claim 31, wherein said filter provides different filtering characteristics in different areas of a beam emitted by the LED lamp.