The Colour Rendering Index or CRI is one of the key metrics lighting specifiers review during the specification process. It is the relative scale on which we compare how well light sources reflect colours back to the human eye. CRI has been a standard part of reputable specs for over 40 years. Yet, I think that if you’ve ever really evaluated light sources you would know that CRI is often an inaccurate way of expressing the quality of a light created.
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