As we all known that the color temperature of a light source is the temperature of an ideal black-body radiator that radiates light of a color comparable to that of the light source. Color temperature is a characteristic of visible light that has important applications in lighting, photography, videography, publishing, manufacturing, astrophysics, horticulture, and other fields. Color temperatures over 5000K are called "cool colors" , while lower color temperatures (2700–3000K) are called "warm colors" .