For those engaged in the lighting industry, the color rendering index CRI is a common term. You often see the CRI value on the data of the light source, and know that it reflects the quality of the light source in terms of color rendering, but its actual meaning is what? The CRI value helps people judge what light source should be used in a lighting device. The higher the CRI value, the better, but do people know what it is actually measuring and how to measure it? For example, a light source has a CRI value of 95. What message does this convey?
â— Definition of CRI
The International Commission on Illumination (CIE) defines color rendering as: the effect of a light source on the color appearance of an object compared to a standard reference light source. In other words, CRI is a measurement method for color recognition when a light source is compared with a standard light source (such as sunlight). CRI is a widely accepted metric and the only way to evaluate and report the color rendering of light sources. The establishment of the CRI standard is not far away. The original purpose of this standard was to use it to describe the color rendering of fluorescent lamps that have been widely used since the 1960s, and to help users understand that fluorescent lamps with linear spectral distribution can be applied. What occasions.
Figure 1: 14 standard CRI color samples
The measurement of CRI is closely related to the difference between the appearance of the prescribed 14 color samples (hereinafter referred to as "color samples") under the measured light source and the appearance under the standard reference light source. Although the derivation of CRI is through mathematical methods, and an actual color chart can not be used to determine the CRI value, but the colors of these color samples are real, they are selected from Munsell color samples. As shown in Figure 1, there are 14 standard CRI color samples. The first 8 color samples are usually used to determine the general color rendering index (usually the CRI value that people refer to refers to the general color rendering index). The selected TCS01-TCS08 has medium saturation It is about the same brightness, and the color range covers the entire visible spectrum. The last 6 are special color samples. TCS09-TCS14 are rarely used. In addition to imitating European skin and green leaves, they also include more saturated primary colors.
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