Color temperature (Kelvin, K)

The color temperature of the light from a light source is defined in comparison to a black body radiator, and is presented in a chromaticity coordinate system according to the Planck temperature curve. A light bulb with a warm tone light, for example, has a color temperature of 2,700 K. A light source resembling daylight may have a color temperature of 6,000 K. Color temperature should always be indicated with a chromaticity diagram.