Colors that look different under different light sources are said to suffer from metamerism. The printing industry has standardized worldwide on a 5,000 K lighting standard for proofing and checking production proofs in the graphic arts. Since lighting varies so much from office to office, plant to plant, a single color viewing standard is needed. Even where a product is intended for viewing in a known lighting condition, the proofing and color correction of that product should take place under 5,000 K lighting. 

See 5000 K. |