Lighting systems having multiple light sources

• US 10,477,636 B1
• Filed: 10/28/2014
• Issued: 11/12/2019
• Est. Priority Date: 10/28/2014
• Status: Active Grant

• Current Assignee: Korrus Incorporated (MKD Electric, Inc.)
• Original Assignee: EcoSense Lighting Inc.
• Inventors: Petluri, Raghuram L. V., Pickard, Paul
• Primary Examiner(s): Hammond, Dedei K
• Assistant Examiner(s): Chai, Raymond R
• Application Number:
  US14/526,504
• Time in Patent Office: 1,841 Days
• CPC Class Codes: H01L 25/13 the devices being of a type provided for in group H01L33/00
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H05B 45/22 using optical feedback
• CPC Class Codes: H05B 45/44 with an active control inside an LED matrix
• CPC Class Codes: H05B 45/60 Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]

Abstract

Lighting system including first-, second-, and third-light sources each having semiconductor light-emitting device. First source includes lumiphor; and is configured for emitting first light source emissions having first color point between isotherms of CCTs of about 4800K-2500K; and is located within about 0.006 delta(uv) away from Planckian-black-body locus of CIE 1931 XY chromaticity diagram. Second light source is configured for emitting second light source emissions having second color point between isotherms of CCTs of about 2900K-1700K. Third light source is configured for emitting third light source emissions having: third color point between line-of-purples and isotherm of CCT of about 1500K; and dominant- or peak-wavelength between about 590-700 nanometers. Lighting system is configured for forming combined light emissions and causing combined color points to remain below Planckian-black-body locus by about 0.001-0.009 delta(uv) throughout light brightening/dimming curve. Related processes.

Claims

1. A lighting system, comprising:

a first light source that includes a first semiconductor light-emitting device and includes a first lumiphor configured for converting light emissions of the first semiconductor light-emitting device having a first spectral power distribution into first light source emissions having another spectral power distribution being different than the first spectral power distribution, wherein the first light source is configured for emitting the first light source emissions as having a first color point, wherein the first color point is located between an isotherm of a correlated color temperature of about 4800K and an isotherm of a correlated color temperature of about 2500K, and wherein the first color point is located within a distance of about equal to or less than 0.006 delta(uv) away from a Planckian-black-body locus of the International Commission on Illumination (CIE) 1931 XY chromaticity diagram;

a second light source that includes a second semiconductor light-emitting device, wherein the second light source is configured for emitting second light source emissions having a second color point, wherein the second color point is located between an isotherm of a correlated color temperature of about 2900K and an isotherm of a correlated color temperature of about 1700K; and

a third light source that includes a third semiconductor light-emitting device, wherein the third light source is configured for emitting third light source emissions having a third color point, wherein the third color point is located between a line-of-purples of the CIE 1931 XY chromaticity diagram and an isotherm of a correlated color temperature of about 1500K, and wherein the third light source is configured for emitting the third light source emissions as having a dominant- or peak-wavelength being within a range of between about 590 nanometers and about 700 nanometers;

wherein the lighting system forms combined light emissions having a series of combined color points, wherein the combined light emissions include the first light source emissions, and the second light source emissions, and the third light source emissions; and

wherein the lighting system causes the series of the combined color points of the combined light emissions to emulate color points of an incandescent light emitter by causing a progression of the series of the combined color points to remain below the Planckian-black-body locus throughout a light brightening/dimming curve of correlated color temperatures (CCTs).

2. The lighting system of claim 1, wherein the lighting system is configured for causing the progression of the series of the combined color points of the combined light emissions to remain below the Planckian-black-body locus by a distance being within a range of between about 0.001 delta(uv) and about 0.009 delta(uv) throughout the light brightening/dimming curve as including a brightened terminus having a CCT being within a range of between about 3400K and about 2700K and as including a dimmed terminus having a CCT being within a range of between about 2200K and about 1700K.

3. The lighting system of claim 1, wherein each one of the light sources of the lighting system has a color point being located between the line-of-purples and the isotherm of the correlated color temperature of about 4800K.

4. The lighting system of claim 1, wherein the lighting system causes the progression of the series of the combined color points to remain below the Planckian-black-body locus by a distance being within a range of between about 0.001 delta(uv) and about 0.009 delta(uv) throughout the light brightening/dimming curve.

5. The lighting system of claim 1, wherein the lighting system is configured for causing the combined light emissions to have the combined color points as being substantially constant throughout the light brightening/dimming curve.

6. The lighting system of claim 1, wherein the lighting system is configured for causing a distance of the combined color points of the combined light emissions below the Planckian-black-body locus to have a maximum variance of about equal to or less than 0.002 delta(uv) throughout the light brightening/dimming curve.

7. The lighting system of claim 1, wherein the lighting system is configured for causing the combined color points of the combined light emissions to have a color rendition index (CRI-Ra including R_1-15) throughout the light brightening/dimming curve being about equal to or greater than 75.

8. The lighting system of claim 1, wherein the lighting system is configured for causing the combined color points of the combined light emissions to have a color rendition index (CRI-Ra including R_1-8) throughout the light brightening/dimming curve being about equal to or greater than 75.

9. The lighting system of claim 1, wherein the lighting system is configured for causing the combined color points of the combined light emissions to have a color rendition index (CRI-R₉) throughout the light brightening/dimming curve being about equal to or greater than 80.

10. The lighting system of claim 1, wherein the lighting system is configured for causing the combined light emissions to perceptually form an unbroken line.

11. The lighting system of claim 1, wherein the lighting system includes a housing;

and wherein the first light source, the second light source, and the third light source are located in the housing.

12. The lighting system of claim 11, wherein the lighting system is configured for causing the first light source emissions to exit from the housing at a distance of about equal to or less than 13 millimeters away from the first semiconductor light-emitting device.

13. The lighting system of claim 1, wherein the first light source is configured for emitting the first light source emissions as having a first luminous flux;

and the second light source is configured for emitting the second light source emissions as having a second luminous flux; and

the third light source is configured for emitting the third light source emissions as having a third luminous flux.

14. The lighting system of claim 13, wherein the lighting system is configured for controlling the first luminous flux, and the second luminous flux, and the third luminous flux.

15. The lighting system of claim 13, wherein the lighting system is configured for controlling a combined luminous flux of the combined light emissions.

16. The lighting system of claim 15, wherein the lighting system is configured for causing the combined luminous flux to progressively increase along the light brightening/dimming curve from a brightened terminus having a CCT being within a range of between about 3400K and about 2700K to a dimmed terminus having a CCT being within a range of between about 2200K and about 1700K.

17. The lighting system of claim 13, wherein the lighting system includes a control unit being configured for controlling:

the first luminous flux;

the second luminous flux; and

the third luminous flux.

18. The lighting system of claim 17, wherein the lighting system includes a drive unit configured for supplying electrical drive current to each of the semiconductor light-emitting devices.

19. The lighting system of claim 18, wherein the control unit is configured for controlling a distribution of the electrical drive current supplied by the drive unit to the semiconductor light-emitting devices.

20. The lighting system of claim 19, wherein the lighting system includes a sensor being configured for detecting the first luminous flux, the second luminous flux, and the third luminous flux.

21. The lighting system of claim 20, wherein the control unit is configured for utilizing the detected first luminous flux, the detected second luminous flux, and detected third luminous flux in controlling the distribution of the electrical drive current supplied by the drive unit to the semiconductor light-emitting devices.

22. The lighting system of claim 21, wherein the lighting system has a database including look-up tables of luminous flux values for the first luminous flux, the second luminous flux, and the third luminous flux.

23. The lighting system of claim 22, wherein the control unit is configured for controlling the distribution of the electrical drive current supplied by the drive unit to the semiconductor light-emitting devices by comparing the detected first luminous flux, the detected second luminous flux, and the detected third luminous flux with the look-up tables of the luminous flux values.

24. The lighting system of claim 23, wherein the control unit is configured for controlling the distribution of the electrical drive current supplied by the drive unit to minimize any variances between the look-up tables of luminous flux values and the detected first luminous flux, the detected second luminous flux, and the detected third luminous flux.

25. The lighting system of claim 24, wherein the database is configured as including empirically-detected luminous flux values for the first luminous flux, the second luminous flux, and the third luminous flux, each having a combined color point being within a selected chromaticity bin of the CIE 1931 XY chromaticity diagram.

26. The lighting system of claim 19, wherein the lighting system includes a sensor being configured for detecting the combined luminous flux of the combined light emissions.

27. The lighting system of claim 26, wherein the control unit is configured for utilizing the detected combined luminous flux in controlling the distribution of the electrical drive current supplied by the drive unit to the semiconductor light-emitting devices.

28. The lighting system of claim 1, wherein the first light source is configured for emitting light having the first color point as being white.

29. The lighting system of claim 1, wherein the first color point has a correlated color temperature being within a range of between about 4800K and about 2500K.

30. The lighting system of claim 1, wherein the first color point is located within a distance of about equal to or less than 0.003 delta(uv) away from the Planckian-black-body locus.

31. The lighting system of claim 1, wherein the first color point has a correlated color temperature being within a range of between about 3615K and about 3315K;

and wherein the first color point is located within a distance of about equal to or less than 0.003 delta(uv) away from the Planckian-black-body locus.

32. The lighting system of claim 1, wherein the first color point is located within a boundary defined by lines connecting together the following series of (x,y) coordinate pairs of color points of the CIE 1931 XY chromaticity diagram:

(0.4813, 0.4319);

(0.4562, 0.4260);

(0.4299, 0.4165);

(0.4006, 0.4044);

(0.3736, 0.3874);

(0.3548, 0.3736);

(0.3512, 0.3465);

(0.3670, 0.3578);

(0.3889, 0.3690);

(0.4147, 0.3814);

(0.4373, 0.3893);

(0.4593, 0.3944); and

(0.4813, 0.4319).

33. The lighting system of claim 1, wherein the first color point is located within a boundary defined by lines connecting together the following series of (x,y) coordinate pairs of color points of the CIE 1931 XY chromaticity diagram:

(0.402091, 0.395912);

(0.396327, 0.379416);

(0.412729, 0.387371);

(0.419887, 0.404681); and

(0.402091, 0.395912).

34. The lighting system of claim 1, wherein the second light source is configured for emitting light having the second color point as being white.

35. The lighting system of claim 1, wherein the second light source is configured for emitting light having the second color point as being:

yellow;

amber;

yellowish-orange;

orange;

reddish-orange;

red;

or deep red.

36. The lighting system of claim 1, wherein the second color point has a correlated color temperature being within a range of between about 2900K and about 1700K.

37. The lighting system of claim 1, wherein the second color point is located within a distance of about equal to or less than 0.006 delta(uv) away from the Planckian-black-body locus.

38. The lighting system of claim 1, wherein the second color point is located within a distance of about equal to or less than 0.003 delta(uv) away from the Planckian-black-body locus.

39. The lighting system of claim 1, wherein the second color point has a correlated color temperature being within a range of between about 2845K and about 2645K;

and wherein the second color point is located within a distance of about equal to or less than 0.003 delta(uv) away from the Planckian-black-body locus.

40. The lighting system of claim 1, wherein the second light source is configured for emitting light having a dominant- or peak-wavelength being within a range of between about 590 nanometers and about 600 nanometers.

41. The lighting system of claim 1, wherein the second color point is located within a distance of about equal to or less than 0.025 delta(uv) away from the Planckian-black-body locus.

42. The lighting system of claim 1, wherein the second color point is located within a boundary defined by lines connecting together the following series of (x,y) coordinate pairs of color points of the CIE 1931 XY chromaticity diagram:

(0.5650, 0.4200);

(0.5400, 0.4250);

(0.5100, 0.4330);

(0.4813, 0.4319);

(0.4562, 0.4260);

(0.4373, 0.3893);

(0.4593, 0.3944);

(0.4870, 0.4000);

(0.5200, 0.3990);

(0.5450, 0.3975); and

(0.5650, 0.4200).

43. The lighting system of claim 1, wherein the second color point is located within a boundary defined by lines connecting together the following series of (x,y) coordinate pairs of color points of the CIE 1931 XY chromaticity diagram:

(0.456982, 0.418022);

(0.447155, 0.399579);

(0.458901, 0.402322);

(0.469539, 0.420978); and

(0.456982, 0.418022).

44. The lighting system of claim 1, wherein the third light source is configured for emitting light having the third color point as being:

yellow;

amber;

yellowish-orange;

orange;

reddish-orange;

red;

or deep red.

45. The lighting system of claim 1, wherein the third light source is configured for emitting light having a dominant- or peak-wavelength being within a range of between about 610 nanometers and about 670 nanometers.

46. The lighting system of claim 1, wherein the third color point is reddish-orange;

and wherein the third light source is configured for emitting light having a dominant- or peak-wavelength being within a range of between about 610 nanometers and about 620 nanometers.

47. The lighting system of claim 1, wherein the third color point is located within a distance of about equal to or less than 0.025 delta(uv) away from the Planckian-black-body locus.

48. The lighting system of claim 1, wherein the third color point is located within a boundary defined by lines connecting together the following series of (x,y) coordinate pairs of color points of the CIE 1931 XY chromaticity diagram:

(0.562200, 0.437200);

(0.734685, 0.265310);

(0.550000, 0.179540);

(0.550000, 0.300000); and

(0.562200, 0.437200).

49. The lighting system of claim 1, wherein the third light source is configured for emitting light having a dominant- or peak-wavelength being within a range of between about 610 nanometers and about 620 nanometers;

and wherein the third color point is reddish-orange and is in proximity to the following (x,y) coordinate pair of the CIE chromaticity diagram;

(0.6822, 0.3171).

50. The lighting system of claim 1, wherein the third light source is configured for emitting light having a dominant- or peak-wavelength being within a range of between about 620 nanometers and about 630 nanometers;

and wherein the third color point is red and is in proximity to the following (x,y) coordinate pair of the CIE chromaticity diagram;

(0.7000, 0.2992).

51. The lighting system of claim 1, wherein the third light source is configured for emitting light having a dominant- or peak-wavelength being within a range of between about 630 nanometers and about 640 nanometers;

and wherein the third color point is red and is in proximity to the following (x,y) coordinate pair of the CIE chromaticity diagram;

(0.7125, 0.2864).

52. The lighting system of claim 1, wherein the third light source is configured for emitting light having a dominant- or peak-wavelength being within a range of between about 650 nanometers and about 660 nanometers;

and wherein the third color point is deep red and is in proximity to the following (x,y) coordinate pair of the CIE chromaticity diagram;

(0.7186, 0.2804).

53. The lighting system of claim 1, wherein the third light source is configured for emitting light having a dominant- or peak-wavelength being within a range of between about 660 nanometers and about 670 nanometers;

and wherein the third color point is deep red and is in proximity to the following (x,y) coordinate pair of the CIE chromaticity diagram;

(0.7228, 0.2756).

54. The lighting system of claim 1, wherein the first light source includes a fourth semiconductor light-emitting device configured for emitting light having a fourth color point.

55. The lighting system of claim 54, wherein the fourth color point is greenish-blue, blue, or purplish-blue.

56. The lighting system of claim 54, wherein the fourth semiconductor light-emitting device is configured for emitting light having a dominant- or peak-wavelength being within a range of between about 420 nanometers and about 510 nanometers.

57. The lighting system of claim 1, wherein the lighting system is configured for causing the combined color points of the combined light emissions to remain below the Planckian-black-body locus by a distance being within a range of between about 0.001 delta(uv) and about 0.009 delta(uv) throughout the light brightening/dimming curve as including a brightened terminus having a CCT of about 3200K and as including a dimmed terminus having a CCT of about 1800K.

58. The lighting system of claim 1, wherein the lighting system is configured for traversing the light brightening/dimming curve within a time period being within a range of between about 5 seconds and about 12 hours.

59. The lighting system of claim 1, wherein the first color point is located between an isotherm of a correlated color temperature of about 4200K and an isotherm of a correlated color temperature of about 2600K.

60. The lighting system of claim 1, wherein the first color point is located between an isotherm of a correlated color temperature of about 3600K and an isotherm of a correlated color temperature of about 3400K.

61. The lighting system of claim 1, wherein the second color point is located between an isotherm of a correlated color temperature of about 2800K and an isotherm of a correlated color temperature of about 2100K.

62. The lighting system of claim 1, wherein the second color point is located between an isotherm of a correlated color temperature of about 2800K and an isotherm of a correlated color temperature of about 2600K.

63. The lighting system of claim 1, wherein the second semiconductor light-emitting device is configured for emitting light having a color point being greenish-blue, blue, or purplish-blue.

64. The lighting system of claim 1, wherein the third semiconductor light-emitting device is configured for emitting light having a color point being greenish-blue, blue, or purplish-blue.

65. A lighting process, comprising:

providing a lighting system, including;

a first light source that includes a first semiconductor light-emitting device and includes a first lumiphor configured for converting light emissions of the first semiconductor light-emitting device having a first spectral power distribution into first light source emissions having another spectral power distribution being different than the first spectral power distribution, wherein the first light source is configured for emitting the first light source emissions as having a first color point, wherein the first color point is located between an isotherm of a correlated color temperature of about 4800K and an isotherm of a correlated color temperature of about 2500K, and wherein the first color point is located within a distance of about equal to or less than 0.006 delta(uv) away from a Planckian-black-body locus of the International Commission on Illumination (CIE) 1931 XY chromaticity diagram;

a second light source that includes a second semiconductor light-emitting device, wherein the second light source is configured for emitting second light source emissions having a second color point, wherein the second color point is located between an isotherm of a correlated color temperature of about 2900K and an isotherm of a correlated color temperature of about 1700K; and

a third light source that includes a third semiconductor light-emitting device, wherein the third light source is configured for emitting third light source emissions having a third color point, wherein the third color point is located between a line-of-purples of the CIE 1931 XY chromaticity diagram and an isotherm of a correlated color temperature of about 1500K, and wherein the third light source is configured for emitting the third light source emissions as having a dominant- or peak-wavelength being within a range of between about 590 nanometers and about 700 nanometers;

causing the lighting system to form combined light emissions having a series of combined color points, wherein the combined light emissions include the first light source emissions, and the second light source emissions, and the third light source emissions; and

causing the series of the combined color points of the combined light emissions to emulate color points of an incandescent light emitter by causing a progression of the series of the combined color points to remain below the Planckian-black-body locus throughout a light brightening/dimming curve of correlated color temperatures (CCTs).

66. The lighting process of claim 65, wherein causing the progression of the series of the combined color points to remain below the Planckian-black-body locus includes causing the combined color points to remain below the Planckian-black-body locus with the light brightening/dimming curve as including a brightened terminus having a CCT being within a range of between about 3400K and about 2700K and including a dimmed terminus having a CCT being within a range of between about 2200K and about 1700K.

67. The lighting process of claim 65, wherein causing the combined color points to remain below the Planckian-black-body locus includes causing a distance of the combined color points below the Planckian-black-body locus to have a maximum variance of about equal to or less than 0.002 delta(uv) throughout the light brightening/dimming curve.

68. The lighting process of claim 65, wherein causing the lighting system to form combined light emissions includes causing the progression of the series of the combined color points to remain below the Planckian-black-body locus by a distance being within a range of between about 0.001 delta(uv) and about 0.009 delta(uv) throughout the light brightening/dimming curve.

69. The lighting process of claim 65, wherein causing the lighting system to form combined light emissions includes causing the combined light emissions to have the combined color points as being substantially constant throughout the light brightening/dimming curve.

70. The lighting process of claim 65, wherein causing the lighting system to form combined light emissions includes causing the combined color points to have a color rendition index (CRI-Ra including R_1-15) throughout the light brightening/dimming curve being about equal to or greater than 75.

71. The lighting process of claim 65, wherein causing the lighting system to form combined light emissions includes causing the combined color points to have a color rendition index (CRI-Ra including R_1-8) throughout the light brightening/dimming curve being about equal to or greater than 75.

72. The lighting process of claim 65, wherein causing the lighting system to form combined light emissions includes causing the combined color points to have a color rendition index (CRI-R₉) throughout the light brightening/dimming curve being about equal to or greater than 80.

73. The lighting process of claim 65, wherein causing the lighting system to form combined light emissions includes causing the combined light emissions to perceptually form an unbroken line.

74. The lighting process of claim 65, wherein causing the lighting system to form combined light emissions includes:

causing the first light source to emit the first light source emissions as having a first luminous flux; and

causing the second light source to emit the second light source emissions as having a second luminous flux; and

causing the third light source to emit the third light source emissions as having a third luminous flux.

75. The lighting process of claim 74, wherein causing the lighting system to form combined light emissions includes detecting the first luminous flux, the second luminous flux, and the third luminous flux.

76. The lighting process of claim 74, wherein causing the lighting system to form combined light emissions includes controlling the first luminous flux, and the second luminous flux, and the third luminous flux.

77. The lighting process of claim 74, wherein causing the lighting system to form combined light emissions includes controlling a combined luminous flux of the combined light emissions.

78. The lighting process of claim 74, wherein causing the lighting system to form combined light emissions includes causing the combined luminous flux to progressively increase along the light brightening/dimming curve from a brightened terminus having a CCT being within a range of between about 3400K and about 2700K to a dimmed terminus having a CCT being within a range of between about 2200K and about 1700K.

79. The lighting process of claim 74, wherein causing the lighting system to form combined light emissions includes utilizing the detected first luminous flux, the detected second luminous flux, and the detected third luminous flux in controlling a distribution of electrical drive current to the semiconductor light-emitting devices.

80. The lighting process of claim 79, wherein causing the lighting system to form combined light emissions includes controlling the distribution of the electrical drive current to the semiconductor light-emitting devices by comparing the detected first luminous flux, the detected second luminous flux, and the detected third luminous flux with a look-up table of luminous flux values.

81. The lighting process of claim 80, wherein causing the lighting system to form combined light emissions includes detecting the combined luminous flux of the combined light emissions.

82. The lighting process of claim 81, wherein causing the lighting system to form combined light emissions includes utilizing the detected combined luminous flux in controlling the distribution of the electrical drive current to the semiconductor light-emitting devices.

83. The lighting process of claim 82, wherein causing the lighting system to form combined light emissions includes controlling the distribution of the electrical drive current to minimize any variances between the look-up tables of luminous flux values and the detected first luminous flux, the detected second luminous flux, and the detected third luminous flux.

84. The lighting process of claim 83, wherein causing the lighting system to form combined light emissions includes providing the look-up table as including empirically-detected luminous flux values for the first luminous flux, the second luminous flux, and the third luminous flux, each having a combined color point being within a selected chromaticity bin of the CIE 1931 XY chromaticity diagram.

85. The lighting process of claim 65, wherein causing the combined color points to remain below the Planckian-black-body locus includes causing the combined color points to remain below the Planckian-black-body locus with the light brightening/dimming curve as including a brightened terminus having a CCT of about 3200K and including a dimmed terminus having a CCT of about 1800K.

86. The lighting process of claim 65, wherein providing the lighting system includes providing the first light source as including a fourth semiconductor light-emitting device configured for emitting light having a fourth color point.

87. The lighting process of claim 86, wherein providing the lighting system includes providing the first light source as including the fourth semiconductor light-emitting device with the fourth color point as being greenish-blue, blue, or purplish-blue.

88. The lighting process of claim 86, wherein providing the lighting system includes providing the first light source as including the fourth semiconductor light-emitting device as being configured for emitting light having a dominant- or peak-wavelength being within a range of between about 420 nanometers and about 510 nanometers.

89. The lighting process of claim 65, wherein causing the series of the combined color points to emulate color points of an incandescent light emitter includes causing the progression of the series of the combined color points to traverse the light brightening/dimming curve within a time period being within a range of between about 5 seconds and about 12 hours.