Color temperature of a light source is a way to compare the whiteness of the light emitted. A lower color temperature (typically 3000 º K) gives a warm white color. The higher color temperature, the light seems colder. Cool white has a temperature of 4200 º K or even 6500 ° K. Color temperature is measured in degrees Kelvin (K). This relates to the color of light, that would be produced by a tungsten filament lamp with the filament in the color temperature using the Kelvin temperature scale.