What is Color Quality Scale (CQS)
Color Quality Scale (CQS) is a metric system used in the lighting industry to assess the color quality of light sources, specifically solid-state lighting. It was developed as an alternative to the Color Rendering Index (CRI) to address the limitations and criticisms of the CRI. The CRI, originally designed for fluorescent and incandescent lamps, has been found to be unreliable when applied to LED lamps.