What exactly does CRI mean? Color Rendering Index. What is CRI?

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What is CRI?

1. What exactly does CRI mean (not to be confused with CCT)?
The color rendering index, or CRI, is a measurement of how well a lamp illuminates color. It’s not a measurement of brightness, per se, but more an indication of how sharp colors will appear under its light. CRI should not be confused with CCT, which stands for correlated color temperature. The two are related, but represent different qualities of a lamp’s light.
CCT is more a measurement of the light given off by the lamp itself. When you hear people talking about warm white light or cool white light, they are talking about CCT, or the color temperature of the light given off. CRI, on the other hand, is metric of how well a specific lamp illuminates color.

2. But what does it really mean to your eye?
The lighting industry uses CRI values to represent the quality of light a lamp emits—the “trueness” of the way colors appear under that light. CRI is determined by comparing light sources of the same CCT—or color temperature—against a reference source with a CRI of 100. The testing method evaluates the light source’s ability to render eight standardized pastel colors. The difference between the light reflected by the reference source and the light reflected by the test source provides the numeric CRI value. To most eyes, the closer the CRI value is to 100, the better the colors will appear under it.

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