Regulation of wavelength shift and perceived color of solid state lighting with temperature variation

A solid state lighting system, comprising:

• a plurality of arrays of light emitting diodes, wherein the plurality of arrays of light emitting diodes has a first emitted spectrum at a selected intensity level, a first electrical biasing for an array from the plurality of arrays producing a first wavelength shift, and a second electrical biasing for the array from the plurality of arrays producing a second, opposing wavelength shift;
• a temperature sensor coupled to the array from the plurality of arrays of light emitting diodes;
• a plurality of driver circuits, wherein each driver circuit is coupled to a corresponding array from the plurality of arrays of light emitting diodes;
• an interface configured to receive information designating the selected intensity level;
• a memory configured to store a plurality of parameters corresponding to a predetermined range of temperatures;
• and
• a controller coupled to the memory and to a first driver circuit from the plurality of driver circuits, wherein the controller is configured to:
• receive a temperature signal associated with the solid state lighting system;
• retrieve a parameter from the plurality of parameters, wherein the parameter corresponds to the temperature signal from the memory;
• and
• convert the parameter into a first control signal for the first driver circuit to provide a combined first electrical biasing and second electrical biasing to the solid state lighting system to thereby generate emitted light having a second emitted spectrum over the predetermined range of temperatures and within a predetermined variance of the first emitted spectrum.

A solid state lighting system, comprising:

• a plurality of arrays of light emitting diodes, wherein a first array from the plurality of arrays has a first emitted spectrum at a full intensity level, wherein a first electrical biasing for the first array from the plurality of arrays produces a first wavelength shift, and wherein a second electrical biasing for the first array from the plurality of arrays produces a second, opposing wavelength shift;
• a temperature sensor coupled to the first array from the plurality of arrays of light emitting diodes;
• a driver circuit coupled to the first array from the plurality of arrays of light emitting diodes;
• an interface configured to receive information designating a selected intensity level lower than the full intensity level;
• a memory configured to store a plurality of parameters corresponding to a predetermined range of temperatures;
• and
• a controller coupled to the memory and to the driver circuit, wherein the controller is configured to:
• receive a temperature signal associated with the solid state lighting system;
• retrieve a parameter from the plurality of parameters, wherein the parameter corresponds to the temperature signal from the memory;
• and
• convert the parameter into a first control signal for the driver circuit to provide a combined first electrical biasing and second electrical biasing to the solid state lighting system to thereby generate emitted light having a second emitted spectrum over the predetermined range of temperatures and within a predetermined variance of the first emitted spectrum.

An apparatus for controlling an emitted spectrum from an array of light emitting diodes, the apparatus comprising:

• an interface configured to receive information designating a selected intensity level lower than a full intensity level, wherein the array of light emitting diodes is configured to have a first emitted spectrum at the selected intensity level and at a selected temperature, wherein a first electrical biasing for the array produces a first wavelength shift, and wherein a second electrical biasing for the array produces a second, opposing wavelength shift;
• a memory configured to store a plurality of parameters corresponding to a plurality of intensity levels and a plurality of temperatures, wherein a parameter from the plurality of parameters corresponds to the selected intensity level and a sensed or determined temperature;
• and
• a controller coupled to the memory, wherein the controller is configured to retrieve the parameter from the memory and to convert the parameter into a corresponding control signal to provide a combined first electrical biasing and second electrical biasing to the array to thereby 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.