The color rendering index is a measure of the consistency between the color presented by the light source and the color presented by the object itself. The color rendering index is an important indicator to measure the quality of the light source. The higher the color rendering index of the light source, the more it can show the true color of the illuminated object, that is, the better the color reproduction. If the color rendering index is low, the color of the illuminated object will be distorted, that is, color distortion will occur. Therefore, the requirements for lights in the studio are becoming more and more stringent. In order to restore the true colors of the characters in the studio, the color rendering index of lights is required to reach 95 or more.