Patent ID: 8410723

Claim:
A light emitting diode (LED) lighting system for producing white light, the system comprising a first set of LEDs arranged to emit light with a first wavelength range and a first set of characteristics; a second set of LEDs arranged to emit light with a second wavelength range and a second set of characteristics; a third set of LEDs arranged to emit light with a third wavelength range and a third set of characteristics; and a driving circuit arranged to drive said sets of LEDs, comprising an input for parameters determining desired light intensity and color; an input for signals for LED temperatures of the sets of LEDs; a model for determining driving currents for said sets of LEDs from said parameters, signals, and sets of characteristics for each of said sets of LEDs; and a current driver for providing said determined currents to said sets of LEDs wherein, said third set of LEDs comprises a first subset of LEDs with a first wavelength sub-range and a fourth set of characteristics, and a second subset of LEDs with a second wavelength sub-range different than said first wavelength sub-range and a fifth set of characteristics, wherein said third wavelength range is a lumped wavelength range of said first and second wavelength sub-ranges, and said third set of characteristics is a function of said fourth and fifth sets of characteristics.