For example, tungsten/incandescent, “cool white” fluorescent, etc. sources have fairly well known spectral energy distributions which can be used to calculate the chromaticity coordinates of the ambient which is adding to {HEAD ~ the light} emitted from {TAIL ~ the display} 
emitted from
For example , tungsten / incandescent , “ cool white ” fluorescent , etc . sources have fairly well known spectral energy distributions which can be used to calculate the chromaticity coordinates of the ambient which is adding to { HEAD ~ the light } emitted from { TAIL ~ the display }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL