High color rendering index LED cold light source is related to the subjective experience of the observer. Everyone see a high color after the cold light feeling, others difficult to know. So the study of CRI 90 cold light source is always full of mysterious imagination. Therefore, the research of High color rendering index  cold light source and the objective quantitative description of High color rendering index LED cold light source become the object of many scientists. High color rendering index LED cold light source color can not be separated from the lighting, only in the CRI 90 cold light source objects are likely to show color, and the CRI 90 cold light source color on people's psychology has a very big impact.

General color rendering index Ra High color rendering index LED cold light source color rendering method, hoping to be both simple and practical. However simple and practical are often two conflicting requirements. In the CIE color system, general CRI 90 cold light soure color index Ra is such a product of compromise: it is relatively simple, only one less than 100 of the value, can express the explicit color performance index 90 color cold light source, Ra=100 is considered to be the most ideal color.

In fact, in our daily life, often in the test of High color rendering index LED cold light source. Many people have such experience, careful woman in the mall to buy clothes, often have to look at the outdoor daylight of its color. She did, in fact, is to test the High color rendering index cold light source: take a look at the same piece of clothing, under the lighting of the mall lighting and lighting in the sun, the color of the clothes what is the difference. So describe the CRI 90 cold light source color rendering, the need for two additional elements: Daylight (reference light source) and clothing (colored objects).

In High color rendering index cold light source system, in order to determine the color of the altimeter color cold light source, the first step is to choose the reference CRI 90 cold light source to the cold light source, light source, the color of the illuminated objects can improve the display. High color rendering index LED cold light source color system in correlated color temperature color cold light source to height less than 5000K, the color of the closest blackbody as the reference light; when the temperature measured CRI 90 cold light source is greater than 5000K, D light source color temperature most similar as the reference light source. Here is a series of D light color coordinates, color temperature and the available digital representation of sunlight.

Because of the diversity of colors, you need to choose a set of standard colors, so that they can fully represent the commonly used color. High color rendering index cold light source color system chose 8 colors, they have a variety of colors, and has medium lightness and chroma.

In High color rendering index LED cold light source system, the determination of each piece of the standard color plate, color index 90 cold light source color coordinates to be significantly difference in height and color irradiation under cold light source in the reference, we can get the special color index Ri.

Take the arithmetic mean of special color index Ri measured on 8 pieces of standard color plate, get the general color rendering index Ra. The maximum value of the visible color index Ra of visible light is 100, which is considered to be the best color rendering.

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