The most common reference illuminant in the graphic arts sector is the CIE Standard Illuminant D50, which has a correlated color temperature (CCT) of 5000 Kelvin.
This includes companies engaged in the process of creating and producing graphic materials, ranging from advertising agency and photographers to prepress and reprographic companies. In order to provide precise and consistent critical color assessments of monitor soft proofs, hard copy proofs, and prints of all kinds, standardized lighting must be used consistently across this value chain.