"Correlated color temperature (CCT) is a measure of light source color appearance defined by the proximity of the light source's chromaticity coordinates to the blackbody locus, as a single number rather than the two required to specify a chromaticity." . . . . "Correlated Colour Temperature"@en . . "https://www.lrc.rpi.edu/programs/nlpip/lightinganswers/lightsources/whatiscct.asp#:~:text=Correlated%20color%20temperature%20(CCT)%20is,required%20to%20specify%20a%20chromaticity."^^ . "Correlated Color Temperature"@en-us . . .