Patent ID: 8847513

Claim:
A lighting device, comprising: at least a first group of light emitters and a second group of light emitters, a first string and a second string, the first string comprising a first plurality of light emitters, so that when current is supplied to the first string, energy is supplied to the first plurality of light emitters, the second string comprising a second plurality of light emitters, so that when current is supplied to the second string, energy is supplied to the second plurality of light emitters, the first plurality of light emitters comprising at least a first light emitter that emits light having a first color point, and at least a second light emitter that emits light having a second color point, the second color point different from the first color point, the second plurality of light emitters comprising at least a third light emitter that emits light having a third color point and a fourth light emitter that emits light having a fourth color point, the third color point within 0.01 delta u′, v′ coordinates of the first color point, the fourth color point within 0.01 delta u′, v′ coordinates of the second color point; at least a first sensor that detects brightness of at least light that is within 0.01 delta u′, v′ coordinates of the first color point; and at least a second sensor that detects brightness of at least light that is within 0.01 delta u′, v′ coordinates of the second color point, a first ratio, which is equal to (1) the number of light emitters in the first plurality of light emitters that emit light having a color point that is within 0.01 delta u′, v′ of the first color point divided by (2) the number of light emitters in the first plurality of light emitters that emit light having a color point that is within 0.01 delta u′, v′ of the second color point, is greater than a second ratio, which is equal to (1) the number of light emitters in the second plurality of light emitters that emit light having a color point that is within 0.01 delta u′, v′ of the first color point divided by (2) the number of light emitters in the second plurality of light emitters that emit light having a color point that is within 0.01 delta u′, v′ of the second color point.