LIGHTING DEVICE AND METHOD OF MAKING

• US 20110279015A1
• Filed: 05/10/2011
• Published: 11/17/2011
• Est. Priority Date: 05/13/2010
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Van De Ven, Antony Paul, Negley, Gerald H.
• Granted Patent: US 8,896,197 B2
• Time in Patent Office: Days
• US Class Current: 313/501
• CPC Class Codes: F21K 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

A lighting device comprising first and second groups of non-white light sources emitting light outside a first area on a 1976 CIE Chromaticity Diagram bounded by a curves 0.01 u′v′ above and below the blackbody locus and within a second area enclosed by saturated light curves from 430 to 465 nm and from 560 to 580 nm and segments from 465 to 560 nm and from 580 to 430 nm and a supplemental light emitter in the range of 600 to 640 nm. Also, a lighting device, comprising a first string of non-white phosphor converted light sources with excitation sources having dominant wavelengths that differ by at least 5 nm, a second string of non-white light sources, and a third string of supplemental light emitters in the range of 600 to 640 nm.

Claims

1. A lighting device comprising:

a first group of non-white light sources, the non-white light sources, when illuminated, emitting light having u′

, v′

color coordinates which define a point which is (1) outside a first area on a 1976 CIE Chromaticity Diagram which is bounded by a first white-light boundary curve which is 0.01 u′

v′

above the planckian blackbody locus and a second white-light boundary curve which is 0.01 u′

v′

below the planckian blackbody locus, and line segments connecting respective left and right ends of the first white-light boundary curve and of the second white-light boundary curve, and (2) within a second area on a 1976 CIE Chromaticity Diagram which is enclosed by a first saturated light curve extending along all points representing saturated light having wavelength in the range of from about 390 nm to about 500 nm, a line segment extending from a point representing saturated light having wavelength of about 500 nm to a point representing saturated light having wavelength of about 560 nm, a second saturated light curve extending along all points representing saturated light having wavelength in the range of from about 560 nm to about 580 nm, and a line segment extending from a point representing saturated light having wavelength of about 580 nm to a point representing saturated light having wavelength of about 390 nm; and

at least one supplemental light emitter having a dominant emission wavelength in the range of from about 600 nm to about 640 nm.

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

the first group of non-white light sources comprises at least a first phosphor converted solid state light emitter that comprises a first excitation source that emits light having a first dominant wavelength,

the first group of non-white light sources comprises at least a second phosphor converted solid state light emitter that comprises a second excitation source that emits light having a second dominant wavelength, and

the first dominant wavelength differs from the second dominant wavelength by at least 5 nm.

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

the first group of non-white light sources comprises at least a first phosphor light emitting diode comprising a light emitting diode having a dominant wavelength in the range of from about 430 nm to about 480 nm; and

the first group of non-white light sources comprises at least a second phosphor light emitting diode comprising a light emitting diode having a dominant wavelength in the range of from about 450 nm to about 500 nm.

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

the first group of non-white light sources comprises at least a first sub-group of non-white light sources and a second sub-group of non-white light sources,

the first sub-group of non-white light sources, when illuminated, emit light having u′

, v′

color coordinates which define a point which is (1) outside the first area, and (2) within the second area;

the second sub-group of non-white light sources, when illuminated, emit light having u′

, v′

color coordinates which define a point which is (1) outside the first area, and (2) within the second area;

the first sub-group comprises at least a first excitation source that emits light having a first dominant wavelength,

the second sub-group comprises a single illuminator having a second dominant wavelength, and

the first dominant wavelength differs from the second dominant wavelength by at least 5 nm.

5. A lighting device as recited in claim 4, wherein:

the first group of non-white light sources further comprises a third sub-group of non-white light sources,

the third sub-group of non-white light sources, when illuminated, emits light having u′

, v′

color coordinates which define a point which is (1) outside the first area, and (2) within the second area;

the first sub-group of non-white light sources is electrically connected so as to be commonly energized;

the third sub-group of non-white light sources is electrically connected so as to be commonly energized and separately energized from the first sub-group of non-white light sources; and

at least one of the second sub-group of non-white light sources is electrically connected so as to be commonly energized with the first sub-group of non-white light emitters.

6. A lighting device as recited in claim 5, wherein at least one of the second sub-group of non-white light sources is electrically connected so as to be commonly energized with the third sub-group of non-white light emitters.

7. A lighting device as recited in claim 4, wherein an excitation emitter of at least one light source of the second sub-group of non-white light sources has a dominant wavelength in the range of from about 475 nm to about 485 nm.

8. A lighting device as recited in claim 4, wherein:

the first sub-group of non-white light sources is on a first string;

the second sub-group of non-white light sources is on a second string; and

the at least one supplemental light emitter is on a third string.

9. A lighting device as recited in claim 4, wherein:

the first sub-group of non-white light sources comprises at least one phosphor converted solid state light emitter that comprises a first excitation source that emits light having a first dominant wavelength,

the second sub-group of non-white light sources comprises at least one phosphor converted solid state light emitter that comprises a second excitation source that emits light having a second dominant wavelength, and

the first dominant wavelength differs from the second dominant wavelength by at least 5 nm.

10. A lighting device as recited in claim 4, wherein:

the first sub-group of non-white light sources emits light which is more blueish than light emitted by the second sub-group of non-white light sources, and

the second sub-group of non-white light sources emits light which is more yellowish than light emitted by the first sub-group of non-white light sources.

11. A lighting device as recited in claim 1, wherein when the first group of non-white light sources and the at least one supplemental light emitters are emitting light, a mixture of (1) light emitted from the lighting device which was emitted by the first group of non-white light sources, and (2) light emitted from the lighting device which was emitted by the at least one supplemental light emitter would, in the absence of any additional light, have a combined illumination having x, y color coordinates which is within 0.01 u′

v′

of at least one point on the blackbody locus on a 1976 CIE Chromaticity Diagram.

12. A lighting device as recited in claim 1, wherein the lighting device further comprises at least a first power line, and when energy is supplied to the first power line, the lighting device emits light which is within 0.01 u′

v′

of at least one point on the blackbody locus on a 1976 CIE Chromaticity Diagram.

13. A lighting device as recited in claim 1, wherein when the first group of non-white light sources and the at least one supplemental light emitter are emitting light, light emitted from the lighting device which was emitted by non-white light sources that emit light having a dominant wavelength in the range of from about 430 nm to about 480 nm comprises from about 40 percent to about 95 percent of the light emitted from the lighting device.

14. A lighting device as recited in claim 1, wherein the first group of non-white light sources comprises at least one solid state light emitter that has a peak emission wavelength in the range of from about 390 nm to about 480 nm.

15. A lighting device as recited in claim 1, wherein the first group of non-white light sources comprises at least a first luminescent material that has a dominant emission wavelength in the range of from about 560 nm to about 580 nm.

16. A lighting device as recited in claim 1, wherein at least one of the non-white light sources in the first group of non-white light sources, when illuminated, emits 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, the first line segment connecting a first point to a second point, the second line segment connecting the second point to a third point, the third line segment connecting the third point to a fourth point, the fourth line segment connecting the fourth point to a fifth point, and the fifth line segment connecting the fifth point to the first point, the first point having x, y coordinates of 0.32, 0.40, the second point having x, y coordinates of 0.36, 0.48, the third point having x, y coordinates of 0.43, 0.45, the fourth point having x, y coordinates of 0.42, 0.42, and the fifth point having x, y coordinates of 0.36, 0.38.

17. A lighting device as recited in claim 4, wherein the first sub-group of non-white light sources and the second sub-group of non-white light sources each comprise at least one light source having a FWHM value of at least 40 nm.

18. A lighting device as recited in claim 1, wherein when the first group of non-white light sources and the at least one supplemental light emitter are emitting light, a mixture of (1) light emitted from the lighting device which was emitted by the first group of non-white light sources, and (2) light emitted from the lighting device which was emitted by the at least one supplemental light emitter would, in the absence of any additional light, have a correlated color temperature in the range of from about 2,000 K to about 11,000 K.

19. A lighting device as recited in claim 1, wherein when the first group of non-white light sources and the at least one supplemental light emitter are emitting light, a mixture of (1) light emitted from the lighting device which was emitted by the first group of non-white light sources, and (2) light emitted from the lighting device which was emitted by the at least one supplemental light emitter would, in the absence of any additional light, have a CRI of at least Ra 85.

20. A lighting device, comprising:

a first group of non-white light sources, the non-white light sources, when illuminated, emitting light having u′

, v′

color coordinates which define a point which is (1) outside a first area on a 1976 CIE Chromaticity Diagram which is bounded by a first white-light boundary curve which is 0.01 u′

v′

above the planckian blackbody locus and a second white-light boundary curve which is 0.01 u′

v′

below the planckian blackbody locus and (2) within a second area on a 1976 CIE Chromaticity Diagram which is enclosed by a first saturated light curve extending along all points representing saturated light having wavelength in the range of from about 390 nm to about 500 nm, a line segment extending from a point representing saturated light having wavelength of about 500 nm to a point representing saturated light having wavelength of about 560 nm, a second saturated light curve extending along all points representing saturated light having wavelength in the range of from about 560 nm to about 580 nm, and a line segment extending from a point representing saturated light having wavelength of about 580 nm to a point representing saturated light having wavelength of about 390 nm;

at least one supplemental light emitter having a dominant emission wavelength in the range of from about 600 nm to about 640 nm, and

means for generating light which mixes with light emitted by the first group of non-white light sources and light emitted by the at least one supplemental light emitter to produce mixed light that has a color point which is within 0.01 u′

v′

of at least one point on the blackbody locus on a 1976 CIE Chromaticity Diagram.

21. A method of lighting, comprising:

supplying electricity to a first group of non-white light sources to cause the first group of non-white light sources to emit light having u′

, v′

color coordinates which define a point which is (1) outside a first area on a 1976 CIE Chromaticity Diagram which is bounded by a first white-light boundary curve which is 0.01 u′

v′

above the planckian blackbody locus and a second white-light boundary curve which is 0.01 u′

v′

below the planckian blackbody locus and (2) within a second area on a 1976 CIE Chromaticity Diagram which is enclosed by a first saturated light curve extending along all points representing saturated light having wavelength in the range of from about 390 nm to about 500 nm, a line segment extending from a point representing saturated light having wavelength of about 500 nm to a point representing saturated light having wavelength of about 560 nm, a second saturated light curve extending along all points representing saturated light having wavelength in the range of from about 560 nm to about 580 nm, and a line segment extending from a point representing saturated light having wavelength of about 580 nm to a point representing saturated light having wavelength of about 390 nm; and

supplying electricity to at least one supplemental light emitter to cause the at least one supplemental light emitter emit light having a dominant emission wavelength in the range of from about 600 nm to about 640 nm.

22. A method as recited in claim 21, wherein:

the first group of non-white light sources comprises at least a first phosphor converted solid state light emitter that comprises a first excitation source that emits light having a first dominant wavelength,

the first group of non-white light sources comprises at least a second phosphor converted solid state light emitter that comprises a second excitation source that emits light having a second dominant wavelength, and

the first dominant wavelength that differs from the second dominant wavelength by at least 5 nm.

23. A method as recited in claim 21, wherein the first group of non-white light sources comprises at least one phosphor light emitting diode comprising a light emitting diode having a dominant wavelength in the range of from about 430 nm to about 480 nm and at least one phosphor light emitting diode comprising a light emitting diode having a dominant wavelength in the range of from about 450 nm to about 500 nm.

24. A method as recited in claim 21, wherein:

a mixture of (1) light emitted from the lighting device which was emitted by the first group of non-white light sources, and (2) light emitted from the lighting device which was emitted by the at least one supplemental light emitter has, in the absence of any additional light, a combined illumination having x, y color coordinates which is within 0.01 u′

v′

of at least one point on the blackbody locus on a 1976 CIE Chromaticity Diagram.