A Color Rendering Index (CRI) is a quantitative metric of the ability of an artificial light source (i.e. LED, Fluorescent, Halogen, Incandescent, etc.) to accurately reveal the colors of a subject in comparison to a natural light source.

Sunlight, the standard for CRI, is considered to most accurately reveal the colors of a subject.

A CRI of 90 means that the artificial light source is replicating roughly 90% of the visible color spectrum that the sun would produce on the same color.

It is important to note that CRI is independent of color temperature (CCT).  Color temperature is a way to describe the light color produced by a light source. It is measured in degrees of Kelvin (K) on a scale from 1,000 to 10,000.

Applications that may require high 90+ CRI include art gallery lighting, lighting for museums, and retail lighting.

CRI is not a measure of brightness, but how sharp colors would appear under the given light source.

In any given space, the CRI of the light source could have a profound effect on how the paint looks, how the furniture look, and how the people look and feel.

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