CRI is a numerical measure of how well a light source can reveal the true colors of objects compared to a natural or standard light source.
CRI is calculated by comparing the appearance of eight standard color samples under a test light source and a reference light source. The reference light source can be either daylight or a black body radiator, depending on the color temperature of the test light source. The color appearance of each sample is measured by a colorimeter or a spectroradiometer, and the color difference is calculated by using a formula based on the CIE 1931 color space. The average color difference of the eight samples is then subtracted from 100 to obtain the CRI value.
CRI values range from 0 to 100, with 100 being the best possible score. A higher CRI means that Mingtai shadowless lamp source can render colors more accurately and naturally, while a lower CRI means that the light source can distort or dull colors. Generally, a CRI of 90 or above is considered excellent, a CRI of 80 or above is considered good, and a CRI below 80 is considered poor. However, CRI is not a perfect indicator of color quality, as it has some limitations and criticisms.