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Definition:

In order to meet the new needs in the Solid State lighting industry and consumers for communicating color quality of all lighting products, Color Quality Scale (CQS) is being developed at NIST, which evaluates several aspects of the color quality of objects illuminated by the light source.

Explain:

Average color quality scale (CQS):
The method for calculating the CQS is derived from modifications to the method used in the CIE’s Color Rendering Index(CRI). The method evaluates 15 colors to more accurately span the range of normal object colors.

cqs 01

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【Lighting Knowledge】Color Quality Scale (CQS)
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