Abstract
Average color rendering index (Ra) is often used in assessing the color reproduction of objects under a light source. A simple question about “Ra” is that color temperature of light sources is not taken into account to the assessment methodology of color reproducibility. Our study examined the impact of not only Ra but also the color temperature of LED light sources using three experimental methods : subjective assessment of color appearance, categorical color naming method, and measurements of color difference. The results of our three evaluation methods indicate a common suggestion that color appearance under various LED light sources is mainly affected by the color temperature of the light source, not by their Ra.
