Patent ID: 8629611

Claim:
A solid state lighting device, comprising: a first luminescent element configured to emit light having a first spectral distribution, the first luminescent element comprising: a first electroluminescent source emitting a first pump light, and a first light converting element that converts at least some of the first pump light to a first re-emitted light component; and a second luminescent element configured to emit light having a second spectral distribution, the second luminescent element comprising: a second electroluminescent source emitting a second pump light, and a second light converting element that converts at least some of the second pump light to a second re-emitted light component; wherein at least one of the first and second light converting elements comprises a first semiconductor stack including a first potential well; wherein the first and second luminescent elements are disposed so that the light emitted by the first and second luminescent elements combine to provide a device output; and wherein the first and second spectral distributions can be represented by first and second endpoints, respectively, on a line segment on a standard CIE (x,y) color coordinate diagram, the line segment representing a range of possible device outputs for different relative amounts of the light emitted by the first luminescent element and the light emitted by the second luminescent element, at least a portion of the line segment also approximating a Planckian locus at least over a range of color temperatures from 3000K to 5000K.