Color-rendering index


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Color-rendering index

A method for describing the effect of a light source on the color appearance of objects, compared to a reference source of the same color temperature. The highest CRI attainable is 100. Typical cool white fluorescent lamps have a CRI of 62. Lamps having rare-earth phosphors are available with a CRI of 80 and above. In a daylighting context, the CRI defines the spectral transmissive quality of glasses or other transparent materials. In this case, values of 95 or better are considered acceptable.
References in periodicals archive ?
This flat, round surface emitter has a color-rendering index of 80 and a correlated color temperature of 2800K.
At a temperature rating of 5,000 Kelvin, the high-lumen, long-life lamps raised the color-rendering index (CRI) from 53 to 85, significantly enhancing the reading experience in the library.
In addition, optimal color temperature, combined with a color-rendering index (CRI) of 93, help provide true tissue color representation.
Most metal-halide lamps offer a color-rendering index (CRI) in the 60s.
At 20mA, emission and color temperature are similar to a daylight-color fluorescent lamp and its color-rendering index is similar to a triphosphor fluorescent lamp.
High brightness LEDs (70 color-rendering index, 5700K color temperature) ensure low comparative lumen loss throughout its 50,000-hour effective life and provide continuing uniformity and brightness.
It offers a color of ~ 4800 CCT and color-rendering index of 72.