CCT is the abbreviation of correlated colour temperature, which means correlated color temperature.
Color temperature refers to when a standard black body is heated, as the temperature increases, its color
changes from deep red to light red to orange to white to blue and white to blue. Using this feature of the black body,
when the light source to be measured When the light color of the black body is the same at a certain temperature,
the temperature of the black body is the color temperature of the light source to be measured.
The premise of this approach is that the spectral distribution of the light source is relatively close to the blackbody locus.
But in fact, the light color of most lighting sources cannot be exactly on the blackbody radiation line, so Raymond Davis et al.
proposed the concept of correlated color temperature. The core idea is to use the shortest distance temperature on the uniform
chromaticity diagram to represent The correlated color temperature of the light source is expressed in K degrees temperature.