In order to differentiate the various hues of white, artificial light sources like LED lightbulbs are labeled with a correlated color temperature, or CCT. CCT is measured in degrees Kelvin (K), and this temperature rating indicates what tone of white light will be emitted from the light fixture.
Just so, what is a CCT in lighting?
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.
What does the K stand for in LED lights?
A measure of the color of a light source relative to a black body at a particular temperature expressed in degrees Kelvin (K). Incandescent lights have a low color temperature (approx. 2800K) and have a red-yellowish tone. Warm white LED Lamps have a color temperature between 2700-3500K.
What is CRI and CCT?
Light sources that are not incandescent radiators have what is referred to as a "Correlated Color Temperature" (CCT). These light sources are measured in their ability to accurately render all colors of their spectrum, in a scale is called the Color Rendering Index (CRI).