Color Rendering Index (CRI)
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CRI is a measure of a light source's ability to show object colors "realistically" or "naturally" compared to a familiar reference source, either incandescent light or daylight.
Source: GREEN EFFORTS White Paper #5, Terminal Lighting by LED and LEP; http://www.lrc.rpi.edu/programs/nlpip/lightinganswers/lightsources/whatisColorRenderingIndex.asp
