What does CRI (Colour Rendering Index) mean in the Lighting Industry?

The Color Rendering Index (CRI) is a system that rates a light’s source accuracy to render an object’s true color. This rating system is based on a 0 to 100 scale. The higher the CRI number, the richer the color appears. Differences in the CRI units can be detected by the eye if the difference is 3 or more points. Bulbs that have a CRI of 80 and above are considered to be good.