System and method for regulation of solid state lighting

• US 8,253,349 B2
• Filed: 08/18/2010
• Issued: 08/28/2012
• Est. Priority Date: 09/21/2007
• Status: Active Grant

• Current Assignee: Chemtron Research LLC (Intellectual Ventures LLC)
• Original Assignee: Point Somee LLC (Intellectual Ventures LLC)
• Inventors: Shteynberg, Anatoly, Rodriguez, Harry, Lehman, Bradley M., Zhou, Dongsheng
• Primary Examiner(s): Le, Tung X
• Application Number:
  US12/858,807
• Publication Number:
  US 20110115394A1
• Time in Patent Office: 741 Days
• Field of Search: 315/149, 315/152, 315/155, 315/159, 315/291, 315307-309, 315/DIG.4
• US Class Current: 315/291
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2330/06 Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
• CPC Class Codes: G09G 3/2018 by time modulation using two or more time intervals
• CPC Class Codes: G09G 3/2081 with combination of amplitude modulation and time modulation space and time error diffusion G09G3/2066
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/342 using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
• CPC Class Codes: H05B 45/24 using electrical feedback from LEDs or from LED modules
• CPC Class Codes: H05B 45/28 using temperature feedback
• CPC Class Codes: H05B 45/3725 Switched mode power supply [SMPS]

Abstract

Exemplary embodiments of the invention provide a system, apparatus, and method of controlling an intensity and spectrum of light emitted from a solid state lighting system. The solid state lighting has a first emitted spectrum at full intensity and at a selected temperature, with a first electrical biasing for the solid state lighting producing a first wavelength shift, and a second electrical biasing for the solid state lighting producing a second, opposing wavelength shift. Exemplary embodiments provide for receiving information designating a selected intensity level or a selected temperature; and providing a combined first electrical biasing and second electrical biasing to the solid state lighting to generate emitted light having the selected intensity level and having a second emitted spectrum within a predetermined variance of the first emitted spectrum over a predetermined range of temperatures.

Claims

1. A method of varying an intensity of light emitted from a light emitting diode, the method comprising:

receiving an input control signal for an intensity level;

retrieving a first parameter of a plurality of parameters stored in a memory, wherein the first parameter designates, for the intensity level, a combination of a first electrical biasing for the light emitting diode and a second electrical biasing for the light emitting diode, wherein the first electrical biasing produces a first wavelength shift, and wherein the second electrical biasing produces a second wavelength shift that is opposed to the first wavelength shift;

using the first parameter, determining an input electrical biasing control signal; and

operating the light emitting diode using input electrical biasing control signal to provide the intensity level.

2. The method of claim 1, wherein said operating the light emitting diode using the input electrical biasing control signal further comprises:

using the input electrical biasing control signal, providing power to the light emitting diode with a time-averaged modulation of forward current to provide the intensity level within a dimming cycle.

3. The method of claim 1, wherein emitted light from the light emitting diode at the intensity level has a peak wavelength within a predetermined variance of a full intensity peak wavelength.

4. The method of claim 1, wherein the input control signal is provided by a device selected from the group consisting of:

a lighting controller, a microprocessor, a remote controller, an AC phase modulation controller, a manual controller, a dimmer switch, and combinations thereof.

5. The method of claim 1, wherein the input control signal has an analog or digital form compatible with an input interface of a controller of an LED driver.

6. The method of claim 1, further comprising:

selecting the first electrical biasing for the light emitting diode to produce the first wavelength shift in response to a first variation of the intensity level; and

selecting the second electrical biasing for the light emitting diode to produce the second wavelength shift in response to a second variation of the intensity level.

7. The method of claim 6, further comprising:

statistically characterizing the light emitting diode for the first electrical biasing and the second electrical biasing as a function of intensity levels.

8. The method of claim 7, further comprising:

predicting the operation of the light emitting diode from the application of the combination of the first electrical biasing and the second electrical biasing during symmetrical or asymmetrical dimming cycles for a predetermined range of intensity variation.

9. The method of claim 7, further comprising:

predicting the combination of the first electrical biasing and the second electrical biasing to control both intensity and wavelength shifts.

10. The method of claim 9, further comprising:

predicting the combination of the first electrical biasing and the second electrical biasing to control intensity and to provide that any time-averaged wavelength shifts are substantially close to zero.

11. The method of claim 9, further comprising:

storing the predicted combination as the first parameter of the plurality of parameters in the memory.

12. The method of claim 9, further comprising:

storing the predicted combination as the first parameter of the plurality of parameters in the form of a look-up table in the memory.

13. The method of claim 9, further comprising:

storing the predicted combination in the memory as linear or functional equation for intensity adjustment within every dimming cycle or every second dimming cycle for the first electrical biasing and the second electrical biasing.

14. The method of claim 1, wherein the first electrical biasing and the second electrical biasing comprise a forward current or bias voltage of the light emitting diode.

15. The method of claim 1, wherein the first electrical biasing comprises an adaptation of an average DC current using any waveform of analog current control.

16. The method of claim 1, wherein the second electrical biasing comprises a pulse-modulated current.

17. The method of claim 1, wherein the second electrical biasing comprises a modulation selected from the group consisting of:

pulse width modulation, pulse frequency modulation, pulse amplitude modulation, a time-averaged pulse modulated current, and combinations thereof.

18. The method of claim 1, wherein the combination of the first electrical biasing and the second electrical biasing comprises a combination of non-zero signals of the first electrical biasing and the second electrical biasing which regulate wavelength emission while maintaining a substantially constant average intensity of the light emitting diode.

19. The method of claim 1, wherein the combination of the first electrical biasing and second electrical biasing comprises a combination of pulse width modulation and constant current regulation within a single dimming cycle.

20. The method of claim 1, wherein the combination of the first electrical biasing and second electrical biasing comprises a combination of forward current pulse modulation and analog regulation alternating every two consecutive dimming cycles.

21. The method of claim 1, wherein the combination of the first electrical biasing and second electrical biasing comprises a combination of forward current pulse modulation and analog regulation alternating every three consecutive dimming cycles.

22. The method of claim 1, wherein the combination of the first electrical biasing and second electrical biasing comprises a combination of forward current pulse modulation and analog regulation alternating an equal number of consecutive dimming cycles.

23. The method of claim 1, wherein the combination of the first electrical biasing and second electrical biasing comprises a combination of forward current pulse modulation and analog regulation alternating an unequal number of consecutive dimming cycles.

24. The method of claim 1, wherein the combination of the first electrical biasing and second electrical biasing comprises a forward current pulse modulation with a peak current in a high state and an average current value in a low state.

25. The method of claim 1, wherein the combination of the first electrical biasing and second electrical biasing comprises a combination of forward current pulse modulation and analog regulation of forward current alternating each second dimming cycle with any arbitrary waveform having an average DC component.

26. The method of claim 1, further comprising:

synchronizing the combination of the first electrical biasing and second electrical biasing with a switching cycle of a switch mode LED driver.

27. The method of claim 26, wherein the combination of the first electrical biasing and second electrical biasing has a duty cycle and an average current level which are related to the selected intensity level according to a first relation of

28. The method of claim 1, wherein the combination of the first electrical biasing and second electrical biasing comprises a superposition of an AC signal on a DC signal.

29. A lighting system having variable intensity, wherein the system is couplable to a user interface for input of an intensity level of a plurality of intensity levels, the lighting system comprising:

a light emitting diode, wherein a first electrical biasing for the light emitting diode is configured to produce a first wavelength shift, and wherein a second electrical biasing for the light emitting diode is configured to produce a second wavelength shift that is opposed to the first wavelength shift;

a driver circuit coupled to the light emitting diode, wherein the driver circuit is configured to provide, in response to a first input operational signal, a combination of the first electrical biasing and the second electrical biasing to the light emitting diode;

a memory storing a plurality of parameters, wherein a first parameter of the plurality of parameters corresponds to the intensity level and designates the combination of the first electrical biasing and the second electrical biasing; and

a controller coupled to the driver circuit, wherein the controller is configured to retrieve the first parameter from the memory and generate the first input operational signal to provide the intensity level.

30. The lighting system of claim 29, wherein the first input operational signal comprises at least one signal, specification or designation selected from the group consisting of:

switching frequency, output current, output voltage, modulation duty cycle, modulation amplitude, modulation frequency, dimming cycle, and combinations thereof.

31. The lighting system of claim 29, wherein emitted light from the light emitting diode at the intensity level has a peak wavelength within a predetermined variance of a full intensity peak wavelength.

32. The lighting system of claim 29, wherein the user interface comprises a device selected from the group consisting of:

a lighting controller, a microprocessor, a remote controller, an AC phase modulation controller, a manual controller, a dimmer switch, and combinations thereof.

33. The lighting system of claim 29, wherein the plurality of parameters are determined as predictions of the combination of the first electrical biasing and the second electrical biasing to control both intensity and wavelength shifts.

34. The lighting system of claim 29, wherein the plurality of parameters are determined as one or more predictions of the combination of the first electrical biasing and the second electrical biasing to control intensity and to provide that any time-averaged wavelength shifts are substantially close to zero.

35. The lighting system of claim 29, wherein the plurality of parameters are stored in the form of a look-up table in the memory.

36. The lighting system of claim 29, wherein the plurality of parameters are stored in the form of a linear or functional equation for intensity adjustment within every dimming cycle or every second dimming cycle for the first electrical biasing and the second electrical biasing.

37. The lighting system of claim 29, wherein the plurality of parameters are determined as predictions of the operation of the light emitting diode from the application of the combination of the first electrical biasing and the second electrical biasing during symmetrical or asymmetrical dimming cycles for a predetermined range of intensity variation.

38. The lighting system of claim 29, wherein the first electrical biasing and the second electrical biasing comprise a forward current or bias voltage of the light emitting diode.

39. The lighting system of claim 29, wherein the first electrical biasing comprises an adaptation of an average DC current using any waveform of analog current control.

40. The lighting system of claim 29, wherein the second electrical biasing comprises a pulse-modulated current.

41. The lighting system of claim 29, wherein the second electrical biasing comprises a modulation selected from the group consisting of:

pulse width modulation, pulse frequency modulation, pulse amplitude modulation, a time-averaged pulse modulated current, and combinations thereof.

42. The lighting system of claim 29, wherein the combination of the first electrical biasing and the second electrical biasing comprises a combination of non-zero signals of the first electrical biasing and the second electrical biasing which regulate wavelength emission while maintaining a substantially constant average intensity of the light emitting diode.

43. The lighting system of claim 29, wherein the combination of the first electrical biasing and second electrical biasing comprises a of combination selected from the group consisting of:

a combination of pulse width modulation and constant current regulation within a single dimming cycle, a combination of forward current pulse modulation and analog regulation alternating every two consecutive dimming cycles, a combination of forward current pulse modulation and analog regulation alternating every three consecutive dimming cycles, a combination of forward current pulse modulation and analog regulation alternating an equal number of consecutive dimming cycles, a combination of forward current pulse modulation and analog regulation alternating an unequal number of consecutive dimming cycles, and combinations thereof.

44. The lighting system of claim 29, wherein the combination of the first electrical biasing and second electrical biasing comprises forward current pulse modulation with a peak current in a high state and an average current value in a low state.

45. The lighting system of claim 29, wherein the combination of the first electrical biasing and second electrical biasing comprises a combination of forward current pulse modulation and analog regulation of forward current alternating each second dimming cycle with any arbitrary waveform having an average DC component.

46. The lighting system of claim 29, wherein the controller is further configured to synchronize the combination of the first electrical biasing and second electrical biasing with a switching cycle of the driver circuit.

47. The lighting system of claim 46, wherein the combination of the first electrical biasing and second electrical biasing has a duty cycle and an average current level which are related to the intensity level according to a first relation of

48. The lighting system of claim 29, wherein the combination of the first electrical biasing and second electrical biasing comprises a superposition of an AC signal on a DC signal.

49. The lighting system of claim 29, wherein the controller is further configured to generate the input electrical biasing control signal to provide a selected lighting effect.

50. The lighting system of claim 29, wherein the controller is further configured to generate the first input operational control signal to control the wavelength of the emitted light within a predetermined variance for the intensity level.

51. The lighting system of claim 29, wherein the controller is further configured to generate the first input operational control signal to maintain the wavelength of the emitted light substantially constant over a predetermined range of a plurality of intensity levels.

52. The lighting system of claim 29, wherein the driver circuit comprises a switch mode driver circuit, and wherein the combination of the first electrical biasing and second electrical biasing comprises a superposition of analog regulation and pulse modulation of forward current in each dimming cycle of the driver circuit.

53. The lighting system of claim 29, wherein the memory further comprises a programmable look-up table, wherein the memory and the controller comprise a single integrated circuit, and wherein the controller further comprises

a block of operational signal registers.

54. The lighting system of claim 53, wherein the controller is further configured to program the operational signal registers with at least two peak current amplitude values, at least two current amplitude modulation values, and two current duty cycle values to provide the first input operational signal to the driver circuit to provide the combination of the first electrical biasing and the second electrical biasing for the intensity level and any emission wavelength control input through the user interface.

55. The lighting system of claim 54, wherein the controller is further configured to vary the intensity of the light emitting diode without substantial optical output flickering by alternatively multiplexing the first input operational signal to the driver circuit from a first set of operational signal registers synchronously to an end of a current dimming frame counter while programming asynchronously a second set of operational signal registers with a second input operational signal.

56. The lighting system of claim 55, wherein the controller is further configured to queue the second input operational signal to a current status at the end of the current dimming frame counter.

57. The lighting system of claim 29, wherein the user interface is couplable to a microprocessor or a network using a proprietary or standard interface protocol selected from the group consisting of:

DMX 512, DALI, I²C, SPI, and combinations thereof.

58. The lighting system of claim 29, wherein the driver circuit further comprises a power converter, and wherein the power converter comprises a linear circuit, a switching DC/DC circuit, or a switching AC/DC circuit with a power factor correction circuit.

59. The lighting system of claim 29, further comprising:

a temperature sensor coupled to the light emitting diode and to the controller.

60. The lighting system of claim 59, wherein the controller is further configured to generate the first input operational signal to maintain the intensity level and a wavelength emission within a predetermined variance over a predetermined range of junction temperatures of the light emitting diode.

61. The lighting system of claim 29, further comprising:

an enclosure for the light emitting diode, the controller, and the driver circuit, wherein the enclosure has a terminal couplable to an input power signal.

62. The lighting system of claim 61, wherein the input power signal comprises an AC utility signal.

63. The lighting system of claim 61, wherein the system is couplable to a phase modulation device and the input power signal comprises a phase-modulated AC utility signal.

64. The lighting system of claim 61, wherein the enclosure is compatible with a standard light bulb interface.

65. The lighting system of claim 61, wherein the enclosure is compatible with a standard Edison light bulb socket.

66. An illumination control method for a light emitting diode providing emitted light, the method comprising:

receiving an input control signal designating a first lighting effect;

retrieving a first parameter of a plurality of parameters stored in a memory, wherein the first parameter designates, for the first lighting effect, a combination of a first electrical biasing for the light emitting diode and a second electrical biasing for the light emitting diode, wherein the first electrical biasing produces a first wavelength shift, and wherein the second electrical biasing produces a second wavelength shift that is opposed to the first wavelength shift;

using the first parameter, determining an input electrical biasing control signal; and

using the input electrical biasing control signal, operating the light emitting diode with a time-averaged modulation of forward current to provide the first lighting effect within a dimming cycle.

67. A method of controlling an intensity of light emitted from a light emitting diode with compensation for spectral changes due to temperature variation, wherein the light emitting diode has a first emitted spectrum at full intensity, the method comprising:

receiving an input control signal designating an intensity level;

determining a temperature associated with the light emitting diode;

retrieving a first parameter of a plurality of parameters stored in a memory, wherein the first parameter designates, for the intensity level and the determined temperature, a combination of a first electrical biasing for the light emitting diode and a second electrical biasing for the light emitting diode, wherein the first electrical biasing produces a first wavelength shift, and wherein the second electrical biasing produces a second wavelength shift that is opposed to the first wavelength shift;

using the first parameter, determining an input electrical biasing control signal; and

operating the light emitting diode using the input electrical biasing control signal to provide the intensity level over a predetermined range of temperatures and having a second emitted spectrum within a predetermined variance of the first emitted spectrum.

68. The method of claim 67, wherein said operating the light emitting diode using the input electrical biasing control signal further comprises:

using the input electrical biasing control signal, providing power to the light emitting diode with a time-averaged modulation of forward current to provide the intensity level over the predetermined range of temperatures and having the second emitted spectrum within the predetermined variance of the first emitted spectrum within a dimming cycle.

69. The method of claim 67, wherein emitted light from the light emitting diode at the intensity level has a peak wavelength within the predetermined variance of a full intensity peak wavelength.

70. The method of claim 67, wherein said determining a temperature associated with the light emitting diode further comprises:

sensing a junction temperature associated with the light emitting diode.

71. The method of claim 67, wherein said determining a temperature associated with the light emitting diode further comprises:

sensing device temperature associated with the light emitting diode.

72. The method of claim 67, further comprising:

selecting the first electrical biasing for the light emitting diode to produce the first wavelength shift in response to a first variation of the intensity level and a second variation of temperature; and

selecting the second electrical biasing for the light emitting diode to produce the second wavelength shift in response to a second variation of the intensity level and a second variation of temperature.

73. The method of claim 72, further comprising:

statistically characterizing the light emitting diode for the first electrical biasing and the second electrical biasing as a function of intensity levels and temperature variation.

74. The method of claim 73, further comprising:

predicting the combination of the first electrical biasing and the second electrical biasing to control both intensity and wavelength shifts over temperature variation.

75. The method of claim 74, further comprising:

predicting the combination of the first electrical biasing and the second electrical biasing over temperature variation to control intensity and to provide any time-averaged wavelength shifts are substantially close to zero.

76. The method of claim 74, further comprising:

storing the predicted combination as the plurality of parameters in the memory of a controller for a driver circuit for the light emitting diode.

77. The method of claim 74, further comprising:

storing the predicted combination as the plurality of parameters in the form of a look-up table.

78. The method of claim 74, further comprising:

storing the predicted combination as a linear or functional equation for intensity adjustment within every dimming cycle or every second dimming cycle for the first electrical biasing and the second electrical biasing.

79. The method of claim 67, wherein the first electrical biasing and the second electrical biasing comprise a forward current or bias voltage of the light emitting diode.

80. The method of claim 67, wherein the first electrical biasing comprises an adaptation of an average DC current using any waveform of analog current control and wherein the second electrical biasing comprises a pulse-modulated current.

81. The method of claim 67, wherein the combination of the first electrical biasing and the second electrical biasing comprises a combination of non-zero signals of the first electrical biasing and the second electrical biasing which regulate wavelength emission while maintaining a substantially constant average intensity of the light emitting diode.

82. The method of claim 67, wherein the operation of the light emitting diode with a time-averaged modulation of forward current conforming to the input electrical biasing control signal further provides a selected lighting effect or a substantially constant selected intensity.

83. The method of claim 67, further comprising:

retrieving a second parameter of the plurality of parameters stored in the memory, wherein the second parameter designates a different combination of the first electrical biasing and the second electrical biasing for a different intensity level and the determined temperature;

using the second parameter, determining a second input electrical biasing control signal; and

operating the light emitting diode using the second input electrical biasing control signal to provide the different intensity level over the predetermined range of temperatures and having the second emitted spectrum within the predetermined variance of the first emitted spectrum.

84. A computer-readable storage medium having instructions stored thereon that, in response to execution by a computing device, cause the computing device to:

receive an input control signal for an intensity level;

retrieve a first parameter of a plurality of parameters, wherein the first parameter designates, for the intensity level, a combination of a first electrical biasing for a light emitting diode and a second electrical biasing for the light emitting diode, wherein the first electrical biasing produces a first wavelength shift, and wherein the second electrical biasing produces a second wavelength shift that is opposed to the first wavelength shift;

determine an input electrical biasing control signal using the first parameter; and

operate the light emitting diode using the input electrical biasing control signal to provide the intensity level.

85. The computer-readable storage medium of claim 84, wherein the instructions further cause the computing device to use the input electrical biasing control signal to provide power to the light emitting diode with a time-averaged modulation of forward current to provide the intensity level within a dimming cycle.

86. The computer-readable storage medium of claim 84, wherein the instructions further cause the computing device to:

select the first electrical biasing for the light emitting diode to produce the first wavelength shift in response to a first variation of the intensity level; and

select the second electrical biasing for the light emitting diode to produce the second wavelength shift in response to a second variation of the intensity level.

87. The computer-readable storage medium of claim 86, wherein the instructions further cause the computing device to statistically characterize the first electrical biasing and the second electrical biasing as a function of intensity levels.

88. The computer-readable storage medium of claim 87, wherein the instructions further cause the computing device to predict the combination of the first electrical biasing and the second electrical biasing to control both intensity and wavelength shifts.

89. The computer readable storage medium of claim 88, wherein the instructions further cause the computing device to predict the combination of the first electrical biasing and the second electrical biasing to control intensity and to provide that any time-averaged wavelength shifts are substantially close to zero.

90. The computer-readable storage medium of claim 88, wherein the instructions further cause the computing device to store the predicted combination as the first parameter of the plurality of parameters in the memory.

91. The computer readable storage medium of claim 88, wherein the instructions further cause the computing device to store the predicted combination as the first parameter of the plurality of parameters in the form of a look-up table in the memory.

92. The computer-readable storage medium of claim 88, wherein the instructions further cause the computing device to store the predicted combination as a linear or functional equation for intensity adjustment within every dimming cycle or every second dimming cycle for the first electrical biasing and the second electrical biasing.

93. The computer-readable storage medium of claim 84, wherein the instructions further cause the computing device to synchronize the combination of the first electrical biasing and second electrical biasing with a switching cycle of a switch mode LED driver.

94. A computer-readable storage medium having instructions stored thereon that, in response to execution by a computing device, cause the computing device to:

generate a first electrical biasing for a light emitting diode, wherein the first electrical biasing produces a first wavelength shift;

generate a second electrical biasing for the light emitting diode, wherein the second electrical biasing produces a second wavelength shift that is opposed to the first wavelength shift;

provide, in response to a first input operational signal, a combination of the first electrical biasing and the second electrical biasing; and

store a plurality of parameters, wherein a first parameter of the plurality of parameters corresponds to the intensity level for the light emitting diode and designates the combination of the first electrical biasing and the second electrical biasing.

95. The computer-readable storage medium of claim 94, wherein the instructions further cause the computing device to store the plurality of parameters in the form of a look-up table.

96. The computer-readable storage medium of claim 94, wherein the instructions further cause the computing device to store the plurality of parameters in the form of a linear or functional equation for intensity adjustment within every dimming cycle or every second dimming cycle for the first electrical biasing and the second electrical biasing.

97. The computer-readable storage medium of claim 94, wherein the instructions further cause the computing device to determine the plurality of parameters as predictions from the application of the combination of the first electrical biasing and the second electrical biasing during symmetrical or asymmetrical dimming cycles for a predetermined range of intensity variation.

98. The computer-readable storage medium of claim 94, wherein the instructions further cause the computing device to synchronize the combination of the first electrical biasing and the second electrical biasing with a switching cycle of a switch mode LED driver.

99. The computer-readable storage medium of claim 94, wherein the instructions further cause the computing device to generate the input electrical biasing control signal to provide a selected lighting effect.

100. The computer-readable storage medium of claim 94, wherein the instructions further cause the computing device to generate the first input operational control signal to control the wavelength of the emitted light within a predetermined variance for the intensity level.

101. The computer-readable storage medium of claim 94, wherein the instructions further cause the computing device to generate the first input operational control signal to maintain the wavelength of the emitted light substantially constant over a predetermined range of a plurality of intensity levels.

102. The computer-readable storage medium of claim 94, wherein the instructions further cause the computing device to vary the intensity without substantial optical output flickering by alternatively multiplexing the first input operational signal from a first set of operational signal registers synchronously to an end of a current dimming frame counter while programming asynchronously a second set of operational signal registers with a second input operational signal.

103. The computer-readable storage medium of claim 102, wherein the instructions further cause the computing device to queue the second input operational signal to a current status at the end of the current dimming frame counter.

104. The computer-readable storage medium of claim 94, wherein the instructions further cause the computing device to generate the first input operational signal to maintain the intensity level and a wavelength emission within a predetermined variance over a predetermined range of light emitting diode junction temperatures.

105. A computer-readable storage medium having instructions stored thereon that, in response to execution by a computing device, cause the computing device to:

receive an input control signal designating a first lighting effect;

retrieve a first parameter of a plurality of parameters, wherein the first parameter designates, for the first lighting effect, a combination of a first electrical biasing for a light emitting diode and a second electrical biasing for the light emitting diode, wherein the first electrical biasing produces a first wavelength shift, and wherein the second electrical biasing produces a second wavelength shift that is opposed to the first wavelength shift;

determine an input electrical biasing control signal using the first parameter; and

use the input electrical biasing control signal to operate the light emitting diode with a time-averaged modulation of forward current to provide the first lighting effect within a dimming cycle.

106. A computer-readable storage medium having instructions stored thereon that, in response to execution by a computing device, cause the computing device to:

receive an input control signal designating an intensity level for a light emitting diode having a first emitted spectrum at full intensity;

determine a temperature associated with the light emitting diode;

retrieve a first parameter of a plurality of parameters, wherein the first parameter designates, for the intensity level and the determined temperature, a combination of a first electrical biasing for the light emitting diode and a second electrical biasing for the light emitting diode, wherein the first electrical biasing produces a first wavelength shift, and wherein the second electrical biasing produces a second wavelength shift that is opposed to the first wavelength shift;

determine an input electrical biasing control signal using the first parameter; and

operate the light emitting diode using the input electrical biasing control signal to provide the intensity level over a predetermined range of temperatures and having a second emitted spectrum within a predetermined variance of the first emitted spectrum.

107. The computer-readable storage medium of claim 106, wherein the instructions further cause the computing device to use the input electrical biasing control signal with a time-averaged modulation of forward current to provide the intensity level over the predetermined range of temperatures and having the second emitted spectrum within the predetermined variance of the first emitted spectrum within a dimming cycle.

108. The computer-readable storage medium of claim 106, wherein the instructions further cause the computing device to sense a junction temperature associated with the light emitting diode.

109. The computer-readable storage medium of claim 106, wherein the instructions further cause the computing device to sense a device temperature associated with the light emitting diode.

110. The computer-readable storage medium of claim 106, wherein the instructions further cause the computing device to:

select the first electrical biasing to produce the first wavelength shift in response to a first variation of the intensity level and a first variation of temperature; and

select the second electrical biasing to produce the second wavelength shift in response to a second variation of the intensity level and a second variation of temperature.

111. The computer-readable storage medium of claim 110, wherein the instructions further cause the computing device to statistically characterize the light emitting diode for the first electrical biasing and the second electrical biasing as a function of intensity levels and temperature variation.

112. The computer-readable storage medium of claim 111, wherein the instructions further cause the computing device to predict the combination of the first electrical biasing and the second electrical biasing to control both intensity and wavelength shifts over temperature variation.

113. The computer-readable storage medium of claim 112, wherein the instructions further cause the computing device to predict the combination of the first electrical biasing and the second electrical biasing over temperature variation to control intensity and to provide any time-averaged wavelength shifts are substantially close to zero.

114. The computer-readable storage medium of claim 112, wherein the instructions further cause the computing device to store the predicted combination as the plurality of parameters.

115. The computer-readable storage medium of claim 112, wherein the instructions further cause the computing device to store the predicted combination as the plurality of parameters in the form of a look-up table.

116. The computer-readable storage medium of claim 112, wherein the instructions further cause the computing device to store the predicted combination as a linear or functional equation for intensity adjustment within every dimming cycle or every second dimming cycle for the first electrical biasing and the second electrical biasing.

117. The computer-readable storage medium of claim 106, wherein the instructions further cause the computing device to:

retrieve a second parameter of the plurality of parameters, wherein the second parameter designates a different combination of the first electrical biasing and the second electrical biasing for a different intensity level and the determined temperature;

determine a second input electrical biasing control signal using the second parameter; and

operate the light emitting diode using the second input electrical biasing control signal to provide the different intensity level over the predetermined range of temperatures and having the second emitted spectrum within the predetermined variance of the first emitted spectrum.