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What R9 and CRI means?

To define the term R9, first of all, it is important to understand what the color reproduction index is. The color rendering index is a classification system that measures the precision with which a light source produces the color of an illuminated object. Measures the ability of the light source to display colors of "tactile" or "normal" objects, compared to a familiar reference source, be it daylight or incandescent light. The color rendering index is an average based on R1 to R8. R9 is one of six saturated test colors that are not used to calculate the CRI.

Since you can find a percentage of the mixed red color in the different hues of most processed colors, the ability to reproduce with red precision is the key to accurately represent the colors of the displayed objects. High R9 lamps produce the most vivid colors.

The metric of the color rendering index is divided into 14 color regions from R1 to R14. The color rendering index is an average value based on the color ranges R1 through R8 of the metric, but does not take into account the remaining six additional color references. A high CRI, combined with a high R9 value, produces the most accurate color screen.