Patent ID: 7956554

Claim:
An illumination control method for a plurality of light emitting diodes, the plurality of light emitting diodes comprising at least one or more first light emitting diodes having a first spectrum and at least one or more second light emitting diodes having a second, different spectrum, a first electrical biasing for the at least one or more first light emitting diodes producing a first wavelength shift, a second electrical biasing for the at least one or more first light emitting diodes producing a second wavelength shift opposing the first wavelength shift, a third electrical biasing for the at least one or more second light emitting diodes producing a third wavelength shift, a fourth electrical biasing for the at least one or more second light emitting diodes producing a fourth wavelength shift opposing the third wavelength shift, the method comprising: monitoring an input control signal, the input control signal designating a first intensity level for the at least one or more first light emitting diodes and a second intensity level for the at least one or more second light emitting diodes; retrieving a first plurality of parameters stored in a memory, the plurality of parameters designating a corresponding combination of the first electrical biasing and the second electrical biasing for the first intensity level; retrieving a second plurality of parameters stored in the memory, the second plurality of parameters designating a corresponding combination of the third electrical biasing and the fourth electrical biasing for the second intensity level; processing the first plurality of parameters into at least one first input electrical biasing control signal for the at least one or more first light emitting diodes; processing the second plurality of parameters into at least one second input electrical biasing control signal for the at least one or more second light emitting diodes; operating the at least one or more first light emitting diodes with a first time-averaged modulation of forward current conforming to the at least one first input electrical biasing control signal to provide the first intensity level; and operating the at least one or more second light emitting diodes with a second time-averaged modulation of forward current conforming to the at least one second input electrical biasing control signal to provide the second intensity level independently of the first intensity level.