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The Color Rendering Index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with an ideal or natural light source. The CRI is originally designed to evaluate fluorescent lamps. The CRI was intended to measure the ‘naturalness’ of objects’ colors, not preference. It has been found that the CRI is not reliable when used for LED lamps.

A successor, the Color Quality Scale (CQS), has implemented a number of improvements making it an alternative to the CRI and a better method for determining the color quality.
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