What are the standard comparisons used to evaluate the color quality of light sources?
Color Rendering Index - CRI indicates the accuracy with which a light source such as an LED can reveal the various colors of an object. The standard CRI system is based on eight colors across the spectrum.
Additional R-values of CRI are used to represent certain colors. The appropriate R-values are application specific. For example R9 represents red and is good for lighting flesh. It also tends to make the light warmer.
Color Quality Scale CQS is a new system that uses a wider palette of 15 reference colors against the smaller palette of 8 reference colors used for the CRI system.