Solid state lighting devices and methods of manufacturing the same

• US 8,866,410 B2
• Filed: 10/24/2008
• Issued: 10/21/2014
• Est. Priority Date: 11/28/2007
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Negley, Gerald H., Van De Ven, Antony Paul, Byrd, Kenneth R., Myers, Peter J., Harris, Michael
• Primary Examiner(s): Tran, Thienvu
• Assistant Examiner(s): LO, CHRISTOPHER KWOK YEUNG
• Application Number:
  US12/257,804
• Publication Number:
  US 20090160363A1
• Time in Patent Office: 2,188 Days
• Field of Search: 315/185.S, 315/200.A, 315322-324, 315/291, 315/312, 315/307, 362/84, 362/231, 362/260, 362/545, 362/612, 362/800, 313/483, 313/485, 313/487, 345 82- 83, 345/102
• US Class Current: 315/307
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/22 using optical feedback

Abstract

Lighting devices comprising first, second and third strings of solid state lighting devices. One aspect further comprises means for supplying first fixed current through the first string, means for supplying second fixed current through the second string, and means for supplying current through the third string. In a second aspect, the first and second strings emit light within a specific area on a 1931 CIE Chromaticity Diagram, and the third string emits light of dominant wavelength 600-640 nm. A third aspect further comprises a power line and a power supply configured to supply a first and second fixed currents through the first and second strings, respectively, and supply a current to the third string. A method of making a lighting device, comprising measuring color output, adjusting current to first, second and/or third strings, and permanently setting currents to the first and second strings.

Claims

1. A lighting device, comprising:

at least a first string of solid state lighting devices, a second string of solid state lighting devices and a third string of solid state lighting devices;

at least a first power line;

means for supplying a permanently established first set current through said first string of solid state lighting devices when line voltage is supplied to said first power line, said means for supplying a permanently established first set current incapable of being adjusted to supply through said first string of solid state light emitters any current other than said permanently established first set current when line voltage is supplied to said first power line;

means for supplying a permanently established second set current through said second string of solid state lighting devices when line voltage is supplied to said first power line, said means for supplying a permanently established second set current incapable of being adjusted to supply through said second string of solid state light emitters any current other than said permanently established second set current when line voltage is supplied to said first power line; and

means for supplying through the third string of solid state lighting devices a third string current.

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

said means for supplying a first fixed current comprises a means for supplying a first fixed current which is based on;

a hue of light output from said solid state lighting devices in said first string,

a hue of light output from said solid state lighting devices in said second string,

a hue of light output from said solid state lighting devices in said third string,

a lumen output from said solid state lighting devices in said first string,

a lumen output from said solid state lighting devices in said second string,

a lumen output from said solid state lighting devices in said third string, and

a target zone for a hue of light output from said lighting device;

said means for supplying a second fixed current comprises a means for supplying a second fixed current which is based on;

a hue of light output from said solid state lighting devices in said first string,

a hue of light output from said solid state lighting devices in said second string,

a hue of light output from said solid state lighting devices in said third string,

a lumen output from said solid state lighting devices in said first string,

a lumen output from said solid state lighting devices in said second string,

a lumen output from said solid state lighting devices in said third string, and

a target zone for a hue of light output from said lighting device; and

said means for supplying a third current comprises a means for supplying a third current which is based on;

a hue of light output from said solid state lighting devices in said first string,

a hue of light output from said solid state lighting devices in said second string,

a hue of light output from said solid state lighting devices in said third string,

a lumen output from said solid state lighting devices in said first string,

a lumen output from said solid state lighting devices in said second string,

a lumen output from said solid state lighting devices in said third string, and

a target zone for a hue of light output from said lighting device.

3. A lighting device as recited in claim 2, wherein said means for supplying a first fixed current comprises a means for supplying a first fixed current which is further based on a target zone for lumen output from said lighting device, said means for supplying a second fixed current comprises a means for supplying a second fixed current which is further based on a target zone for lumen output from said lighting device, and said means for supplying a third current comprises a means for supplying a third current which is further based on a target zone for lumen output from said lighting device.

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

said first string of solid state lighting devices comprises at least one solid state lighting device which, if power is supplied to said first string, 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, 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 a fifth point, and 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,

said second string of solid state lighting devices comprises at least one solid state lighting device which, if power is supplied to said second string, 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, 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 a fifth point, and said filth 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, and

said third string of solid state lighting devices comprises at least one solid state lighting device which, if power is supplied to said third string, emits light having a dominant wavelength in the range of from about 600 nm to about 640 nm.

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

if power is supplied to said first string of solid state lighting devices, hues of light emitted by each solid state lighting device on said first string fall within a first color bin;

if power is supplied to said second string of solid state lighting devices, hues of light emitted by each solid state lighting device on said second string fall within a second color bin; and

said first color bin is different from said second color bin.

6. A lighting device as recited in claim 1, wherein if current is supplied to said first power line, a color of light exiting said lighting device has x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within 10 MacAdam ellipses of at least one point on the blackbody locus on a 1931 CIE Chromaticity Diagram.

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

said third string of solid state lighting devices comprises at least one solid state lighting device which, if power is supplied to said third string, emits light having a dominant wavelength in the range of from about 600 nm to about 640 nm; and

if current is supplied to said first power line, a color of light exiting said lighting device has x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within 10 MacAdam ellipses of at least one point on the blackbody locus on a 1931 CIE Chromaticity Diagram.

8. A lighting device, comprising:

at least a first string of solid state lighting devices, a second string of solid state lighting devices and a third string of solid state lighting devices,

said first string of solid state lighting devices comprising at least one solid state lighting device which, if power is supplied to said first string, 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, 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 a fifth point, and 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,

said second string of solid state lighting devices comprising at least one solid state lighting device which, if power is supplied to said second string, 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, 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 a fifth point, and 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,

said third string of solid state lighting devices comprising at least one solid state lighting device which, if power is supplied to said third string, emits light having a dominant wavelength in the range of from about 600 nm to about 640 urn.

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

if power is supplied to said first string of solid state lighting devices, hues of light emitted by each solid state lighting device on said first string fall within a first color bin;

if power is supplied to said second string of solid state lighting devices, hues of light emitted by each solid state lighting device on said second string fall within a second color bin; and

said first color bin is different from said second color bin.

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

said lighting device further comprises a power line and circuitry wherein;

if any line voltage is supplied to said power line, a first current would pass through each solid state lighting device in said first string of solid state lighting devices.

11. A lighting device as recited in claim 8, wherein said lighting device further comprises:

a sensor which senses an intensity of a mixture of light emitted by said first string of solid state lighting devices and light emitted by said second string of solid state lighting devices; and

circuitry which adjusts a current supplied to said third string of solid state lighting devices in response to said intensity of a mixture of light emitted by said first string of solid state lighting devices and light emitted by said second string of solid state lighting devices.

12. A lighting device as recited in claim 8, wherein said lighting device further comprises a power line, and if current is supplied to said power line, a color of light exiting said lighting device has x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within 10 MacAdam ellipses of at least one point on the blackbody locus on a 1931 CIE Chromaticity Diagram.

13. A lighting device, comprising:

at least a first string of solid state lighting devices, a second string of solid state lighting devices and a third string of solid state lighting devices;

a power line; and

a power supply, said power supply being configured to;

(1) supply a permanently established first set current through said first string of solid state lighting devices when line voltage is supplied to said power line, said power supply incapable of being adjusted to supply through said first string of solid state light emitters any current other than said permanently established first set current when line voltage is supplied to said first power line;

(2) supply a permanently established second set current through said second string of solid state lighting devices when said line voltage is supplied to said power line, said power supply incapable of being adjusted to supply through said second string of solid state light emitters any current other than said permanently established second set current when line voltage is supplied to said first power line; and

(3) supply a third current through said third string of solid state lighting devices.

14. A lighting device as recited in claim 13, wherein:

said power supply is configured to;

(1) supply a first fixed current which is based on;

a hue of light output from said solid state lighting devices in said first string,

a hue of light output from said solid state lighting devices in said second string,

a hue of light output from said solid state lighting devices in said third string,

a lumen output from said solid state lighting devices in said first string,

a lumen output from said solid state lighting devices in said second string,

a lumen output from said solid state lighting devices in said third string, and

a target zone for a hue of light output from said lighting device;

(2) supply a second fixed current which is based on;

a hue of light output from said solid state lighting devices in said first string,

a hue of light output from said solid state lighting devices in said second string,

a hue of light output from said solid state lighting devices in said third string,

a lumen output from said solid state lighting devices in said first string,

a lumen output from said solid state lighting devices in said second string,

a lumen output from said solid state lighting devices in said third string, and

a target zone for a hue of light output from said lighting device; and

(3) supply a third current which is based on;

a hue of light output from said solid state lighting devices in said first string,

a hue of light output from said solid state lighting devices in said second string,

a hue of light output from said solid state lighting devices in said third string,

a lumen output from said solid state lighting devices in said first string,

a lumen output from said solid state lighting devices in said second string,

a lumen output from said solid state lighting devices in said third string, and

a target zone for a hue of light output from said lighting device.

15. A lighting device as recited in claim 14, wherein said power supply is configured to:

supply a first fixed current which is further based on a target zone for lumen output from said lighting device,

supply a second fixed current which is further based on a target zone for lumen output from said lighting device, and

supply a third current which is further based on a target zone for lumen output from said lighting device.

16. A lighting device as recited in claim 13, wherein:

said first string of solid state lighting devices comprises at least one solid state lighting device which, if power is supplied to said first string, 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, 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 a fifth point, and 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,

said second string of solid state lighting devices comprises at least one solid state lighting device which, if power is supplied to said second string, 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, 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 a fifth point, and 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, and

said third string of solid state lighting devices comprises at least one solid state lighting device which, if power is supplied to said third string, emits light having a dominant wavelength in the range of from about 600 nm to about 640 nm.

17. A lighting device as recited in claim 13, wherein:

if power is supplied to said first string of solid state lighting devices, hues of light emitted by each solid state lighting device on said first string fall within a first color bin;

if power is supplied to said second string of solid state lighting devices, hues of light emitted by each solid state lighting device on said second string fall within a second color bin; and

said first color bin is different from said second color bin.

18. A lighting device as recited in claim 13, wherein if current is supplied to said first power line, a color of light exiting said lighting device has x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within 10 MacAdam ellipses of at least one point on the blackbody locus on a 1931 CIE Chromaticity Diagram.

19. A lighting device as recited in claim 13, wherein:

said third string of solid state lighting devices comprises at least one solid state lighting device which, if power is supplied to said third string, emits light having a dominant wavelength in the range of from about 600 nm to about 640 nm; and

if current is supplied to said first power line, a color of light exiting said lighting device has x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within 10 MacAdam ellipses of at least one point on the blackbody locus on a 1931 CIE Chromaticity Diagram.