LIGHTING DEVICE AND METHOD OF LIGHTING

• US 20090161356A1
• Filed: 11/25/2008
• Published: 06/25/2009
• Est. Priority Date: 05/30/2007
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: Cree LED Lighting Solutions Inc (Wolfspeed, Inc.)
• Inventors: Coleman, Thomas G., Van De Ven, Antony Paul, Negley, Gerald H., Edmond, Mark D.
• Granted Patent: US 8,403,531 B2
• Time in Patent Office: Days
• US Class Current: 362/231
• 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 9/238 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21V 23/006 the substrate being distinct from the light source holder
• CPC Class Codes: F21V 29/713 in direct thermal and mechanical contact of each other to form a single system
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/357 specially adapted for retrofit LED light sources
• CPC Class Codes: H05B 45/375 using buck topology
• CPC Class Codes: H05B 45/40 Details of LED load circuits
• CPC Class Codes: H05B 45/56 involving measures to prevent abnormal temperature of the LEDs

Abstract

There is provided a lighting device which emits light with an wall plug efficiency of at least 85 lumens per watt. The lighting device comprises at least one solid state light emitter, e.g., one or more light emitting diodes, and optionally further includes one or more luminescent material. In some embodiments, the output light is of a brightness of at least 300 lumens. In some embodiments, the output light has a CRI Ra of at least 90. Also, a method of lighting, comprising supplying electricity to a lighting device which emits light with a wall plug efficiency of at least 85 lumens per watt.

Claims

1. A lighting device comprising at least one solid state light emitter,

said lighting device, when supplied with electricity of a first wattage, emitting output light having a wall plug efficiency of at least 85 lumens per watt of said electricity.

2. A lighting device as recited in claim 1, wherein said output light is of a brightness of at least 300 lumens.

3. A lighting device as recited in claim 1, wherein said output light is perceived as white.

4. A lighting device as recited in claim 1, wherein said output light has a CRI Ra of at least 90.

5. A lighting device as recited in claim 1, wherein said solid state light emitter is a first light emitting diode.

6. A lighting device as recited in claim 1, wherein said lighting device further comprises at least one luminescent material.

7. A lighting device as recited in claim 1, wherein said lighting device further comprises at least one power line, at least a first group of said light emitting diodes being directly or switchably electrically connected to said power line, a voltage drop across said first group of said light emitting diodes, and across any other components along said power line, being between 1.3 and 1.5 times a standard outlet voltage.

8. A lighting device as recited in claim 1, wherein when said lighting device is supplied with electricity of said first wattage, a mixture of all light exiting from said lighting device which was emitted by any of said at least one solid state light emitter which emit light having a dominant wavelength which is outside the range of between 600 nm and 700 nm would have 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.

9. A lighting device as recited in claim 1, wherein said output light is perceived as warm white.

10. A lighting device as recited in claim 1, wherein said lighting device, when supplied with electricity of a first wattage, emits output light having a wall plug efficiency in the range of from about 85 to about 113.5 lumens per watt of said electricity.

11. A lighting device as recited in claim 1, wherein said lighting device, when supplied with electricity of a first wattage, emits output light having a wall plug efficiency of at least 110 lumens per watt of said electricity.

12. A lighting device as recited in claim 1, wherein said lighting device, when supplied with electricity of a first wattage, emits output light having a wall plug efficiency in the range of from about 100 to about 113.5 lumens per watt of said electricity.

13. A lighting device as recited in claim 1, wherein said electricity is AC electricity.

14. A light device as recited in claim 1, wherein the lighting device comprises a self-ballasted lamp.

15. A lighting device as recited in claim 1, wherein the lighting device further maintains a junction temperature of the solid state light emitter at or below a manufacturer rated junction temperature for a 25,000 hour lifetime in a 25°

C. ambient temperature.

16. A lighting device as recited in claim 1, wherein the lighting device comprises:

one or more strings of light emitting diodes;

a power supply for driving the one or more strings of light emitting diodes from an AC power source;

a heat sink in thermal communication with the light emitting diodes and configured to transfer heat from the light emitting diodes to an ambient environment of the lighting device; and

a diffuser optic configured to balance light transmission with diffusion to obscure the light emitting diode light sources.

17. A method of lighting, comprising providing a lighting device comprising at least one solid state light emitter and having a wall plug efficiency of at least 85 lumens per watt of power.

18. A method as recited in claim 17, wherein output light exiting from said lighting device is of a brightness of at least 300 lumens.

19. A method as recited in claim 17, wherein output light exiting from said lighting device is perceived as white.

20. A method as recited in claim 17, wherein output light exiting from said lighting device has a CRI Ra of at least 90.

21. A method as recited in claim 17, wherein said lighting device has a wall plug efficiency in the range of from about 85 to about 113.5 lumens per watt of said electricity.

22. A method as recited in claim 17, wherein said lighting device has a wall plug efficiency of at least 110 lumens per watt of said electricity.

23. A method as recited in claim 17, wherein said power is AC electricity.

24. A method of lighting, comprising:

providing a lighting device that uses power of a first wattage;

providing at least one solid state light emitter; and

emitting light that has a wall plug efficiency of at least 85 lumens per watt of power.