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A 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 a natural or standard light source.
The color rendering index (CRI) of 1974 is the product of a CIE committee's study on the topic of color rendering. It uses the American colorimetric approach with a panel of human subjects instead of requiring spectrophotometry. Eight samples of varying hue would be alternately lit with two illuminants, and the color appearance compared.
Color Rendering Index (CRI) is determined [9] by the distinctions in the chromaticities of fifteen test color samples (TCS), where objects are illuminated by the light source to be evaluated and a reference illuminant with the same CCT. The higher the CRI value, the smaller the differences between indices will be.
The best-known measure of metamerism is the color rendering index (CRI), which is a linear function of the mean Euclidean distance between the test and reference spectral reflectance vectors in the CIE 1964 color space.
A variation of the high-pressure sodium introduced in 1986, the White HPS has a higher pressure than the typical HPS lamp, producing a color temperature of around 2700 kelvins with a color rendering index (CRI) of about 85, greatly resembling the color of an incandescent light. [25]
Color quality scale (CQS) is a color rendering score – a quantitative measure of the ability of a light source to reproduce colors of illuminated objects. Developed by researchers at NIST [1] the metric aims to overcome some of the issues inherent in the widely used color rendering index (CIE Ra, 1974). [2] [3]
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Color rendering refers to how accurately the light source displays the true colors of objects compared to natural sunlight. Different HID lamps have varying CRI values, with some providing better color rendering than others. HID Headlamp Kelvin Chart. The choice of metal additives and their concentrations enables lamp manufacturers to create ...