Kruithof, Preferred Color Temperature

Abstract

Definition``Kruithof's graph,'' as published in 1941 by Kruithof, that shows, for general lighting in interiors, what combinations of illuminance level and correlated color temperature result in a ``pleasing'' or ``not pleasing'' assessment by persons in that interior.Preferred Correlated Color Temperature (CCT) for General Lighting in InteriorsAround the time of the introduction of tubular fluorescent lamps in the early 1940s, Kruithof was the first who carried out a study on preferred correlated color temperature (CCT) for interior lighting. He investigated the relationship between lighting level in an interior and the CCT of the light sources used, on the assessment of people in terms of pleasantness [1]. His study received much recognition, although many subsequent researchers got inconsistent results. It must be realized that not only the lighting level but aspects as climatic conditions and cultural background influence the preferred illuminance as well.Lighting not only has a visual e ...