1. A lighting device producing white light having a target color correlated temperature (CCT) value, comprising:a plurality of LEDs comprising (i) at least one red LED emitting red light having a wavelength between approximately 600 nm and approximately 670 nm, (ii) at least one warm white LED emitting white light having a CCT value between approximately 1800K and approximately 2700K, and (iii) at least one blue LED emitting blue light having a wavelength between approximately 400 nm and approximately 530 nm;
at least one photo-luminescent material for shifting at least one of (i) the CCT value of the light emitted from at least one said blue LED toward a green CCT value or (ii) the CCT value of the light emitted from at least one said warm white LED toward a yellow CCT value; and
a waveguide material having (i) a mixing region for mixing the shifted and unshifted light so as to generate white light having the target CCT value and (ii) an output region for outputting the white light.