Lighting device and method of lighting

• US 8,596,819 B2
• Filed: 05/30/2007
• Issued: 12/03/2013
• Est. Priority Date: 05/31/2006
• 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, Coleman, Thomas G.
• Primary Examiner(s): Husar, Stephen F
• Assistant Examiner(s): DUNWIDDIE, MEGHAN K
• Application Number:
  US11/755,153
• Publication Number:
  US 20070279903A1
• Time in Patent Office: 2,379 Days
• Field of Search: 362/230, 362/231, 362/545, 362/555, 362/800, 315/291, 313/503, 313/467, 313/468
• US Class Current: 362/249.02
• 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 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21S 8/02 of recess-mounted type, e.g. downlighters specially adapted for vehicle exteriors F21S41/00-F21S45/00
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2924/00011 Not relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/01032 Germanium [Ge]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

There is provided a lighting device which emits light with an efficacy of at least 60 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 lumiphor. 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 an efficacy of at least 60 lumens per watt.

Claims

1. A lighting device comprising at least one light emitting diode,

said lighting device, when supplied with electricity of a first wattage, emitting output light with a wall plug efficiency of at least 60 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 of a brightness of at least 500 lumens.

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

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

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

7. A lighting device as recited in claim 1, wherein said lighting device, when supplied with electricity of said first wattage, emits output light with a wall plug efficiency of at least 70 lumens per watt of said electricity.

8. A lighting device as recited in claim 7, wherein said output light is of a brightness of at least 300 lumens.

9. A lighting device as recited in claim 1, wherein said lighting device, when supplied with electricity of said first wattage, emits output light with a wall plug efficiency of at least 80 lumens per watt of said electricity.

10. A lighting device as recited in claim 9, wherein said output light is of a brightness of at least 300 lumens.

11. A lighting device as recited in claim 1, wherein said lighting device comprises a plurality of light emitting diodes.

12. A lighting device as recited in claim 11, wherein said lighting device further comprises a plurality of lumiphors.

13. A lighting device as recited in claim 12, wherein each of said lumiphors is positioned within about 750 micrometers of at least one of said light emitting diodes.

14. A lighting device as recited in claim 11, 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.

15. A lighting device as recited in claim 14, wherein said standard outlet voltage is 110 volts AC.

16. A lighting device as recited in claim 14, wherein said voltage drop across said first group of said light emitting diodes, and across any other components along said power line, is between 1.410 and 1.420 times said standard outlet voltage.

17. A lighting device as recited in claim 14, wherein said light emitting diodes in said first group of light emitting diodes are arranged in series along said power line.

18. A lighting device as recited in claim 14, wherein said first group of said light emitting diodes comprises a plurality of said light emitting diodes.

19. A lighting device as recited in claim 1, wherein said lighting device further comprises at least one lumiphor.

20. 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 said at least one light emitting diode 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.

21. A lighting device as recited in claim 1, wherein said lighting device further comprises at least one lumiphor, and 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 one of said at least one light emitting diode which emit light having a dominant wavelength which is outside the range of between 600 nm and 700 nm, and all light exiting from said lighting device which was emitted by one of said at least one lumiphor 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.

22. An enclosure, comprising an enclosed space and at least one lighting device as recited in claim 1, wherein when said lighting device is illuminated, said lighting device would illuminate at least a portion of said enclosure.

23. A lighting element, comprising a surface and at least one lighting device as recited in claim 1, wherein when said lighting device is illuminated, said lighting device would illuminate at least a portion of said surface.

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

25. 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 60 to about 70 lumens per watt of said electricity.

26. 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 70 to about 80 lumens per watt of said electricity.

27. 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 80 to about 85 lumens per watt of said electricity.

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

29. A method of lighting, comprising supplying a lighting device with electricity of a first wattage, said lighting device comprising at least one light emitting diode, said lighting device emitting output light with a wall plug efficiency of at least 60 lumens per watt of said electricity.

30. A method as recited in claim 29, wherein said output light is of a brightness of at least 300 lumens.

31. A method as recited in claim 29, wherein said output light is of a brightness of at least 500 lumens.

32. A method as recited in claim 29, wherein said output light is perceived as white.

33. A method as recited in claim 29, wherein said output light is perceived as non-white.

34. A method as recited in claim 29, wherein said output light has a CRI Ra of at least 90.

35. A method as recited in claim 29, wherein said lighting device, when supplied with electricity of said first wattage, emits output light with a wall plug efficiency of at least 70 lumens per watt of said electricity.

36. A method as recited in claim 35, wherein said output light is of a brightness of at least 300 lumens.

37. A method as recited in claim 29, wherein said lighting device, when supplied with electricity of said first wattage, emits output light with a wall plug efficiency of at least 80 lumens per watt of said electricity.

38. A method as recited in claim 37, wherein said output light is of a brightness of at least 300 lumens.

39. A method as recited in claim 29, wherein said at least one light emitting diode comprises a first light emitting diode.

40. A method as recited in claim 39, wherein said lighting device comprises a plurality of light emitting diodes, including said first light emitting diode.

41. A method as recited in claim 40, wherein said lighting device further comprises a plurality of lumiphors.

42. A method as recited in claim 41, wherein each of said lumiphors is positioned within about 750 micrometers of at least one of said light emitting diodes.

43. A method as recited in claim 40, 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 voltage of said electricity.

44. A method as recited in claim 43, wherein said voltage of said electricity is 110 volts AC.

45. A method as recited in claim 43, wherein said voltage drop across said first group of said light emitting diodes, and across any other components along said power line, is between 1.410 and 1.420 times said voltage of said electricity.

46. A method as recited in claim 43, wherein said first group of said light emitting diodes comprises a plurality of said light emitting diodes.

47. A method as recited in claim 29, wherein said lighting device further comprises at least one lumiphor.

48. A method as recited in claim 29, wherein said lighting device emits output light having a wall plug efficiency in the range of from about 60 to about 70 lumens per watt of said electricity.

49. A method as recited in claim 29, wherein said lighting device emits output light having a wall plug efficiency in the range of from about 70 to about 80 lumens per watt of said electricity.

50. A method as recited in claim 29, wherein said lighting device emits output light having a wall plug efficiency in the range of from about 80 to about 85 lumens per watt of said electricity.

51. A method as recited in claim 29, wherein said electricity is AC electricity.

52. A lighting device comprising at least a first light emitting diode,

said lighting device, when supplied with AC electricity of a first wattage, emitting output light having a wall plug efficiency of at least 60 lumens per watt of said electricity, said output light being a quantity of light exiting from the lighting device, said output light being perceived as white light.

53. A lighting device as recited in claim 52, wherein said lighting device comprises a plurality of light emitting diodes, including said first light emitting diode.

54. A lighting device as recited in claim 52, wherein said output light is of a brightness of at least 300 lumens.

55. A lighting device as recited in claim 52, wherein said output light is of a brightness of at least 500 lumens.

56. A lighting device as recited in claim 52, wherein said output light has a CRI Ra of at least 90.

57. A method as recited in claim 52, wherein said lighting device emits output light having a wall plug efficiency in the range of from about 60 to about 70 lumens per watt of said electricity.

58. A method as recited in claim 52, wherein said lighting device emits output light having a wall plug efficiency in the range of from about 70 to about 80 lumens per watt of said electricity.

59. A method as recited in claim 52, wherein said lighting device emits output light having a wall plug efficiency in the range of from about 80 to about 85 lumens per watt of said electricity.

60. A method of lighting, comprising supplying a lighting device with AC electricity of a first wattage, said lighting device comprising at least a first light emitting diode, said lighting device emitting output light having a wall plug efficiency of at least 60 lumens per watt of said electricity, said output light being a quantity of light exiting from the lighting device, said output light being perceived as white light.

61. A lighting device as recited in claim 60, wherein said lighting device comprises a plurality of light emitting diodes, including said first light emitting diode.

62. A lighting device as recited in claim 60, wherein said output light is of a brightness of at least 300 lumens.

63. A lighting device as recited in claim 60, wherein said output light is of a brightness of at least 500 lumens.

64. A lighting device as recited in claim 60, wherein said output light has a CRI Ra of at least 90.

65. A method as recited in claim 60, wherein said lighting device emits output light having a wall plug efficiency in the range of from about 60 to about 70 lumens per watt of said electricity.

66. A method as recited in claim 60, wherein said lighting device emits output light having a wall plug efficiency in the range of from about 70 to about 80 lumens per watt of said electricity.

67. A method as recited in claim 60, wherein said lighting device emits output light having a wall plug efficiency in the range of from about 80 to about 85 lumens per watt of said electricity.