Color performance index
194
2023-08-01
Color performance index
Performance index (English: color rendering index; CRI), or called the color rendering index, is a value that describes the color ability of the light source to show the color of the real object.The higher the color of the light source, the closer its color performance is to the ideal light source or natural light.Industries that attach importance to color performance, such as neonatal nursing (English: NEONATAL NURSING), photography, movie photography, etc., generally prefer high CRI light sources.[1] The definition of the International Lighting Commission is as follows: [2]
The color of the light source depends on its spectrum.
Performance scores are shown in "Color Accuration"
Performance: The color effect caused by the light source to the object is obtained by conscious or unconscious observation compared to the characteristics of the light source.
The color index of a light source, CRI does not directly indicate the color of a light source (color is related to related color temperature).Performance depends on the spectrum of light sources.The incandescent lamp has a continuous spectrum; the fluorescence lamp is a discrete line spectrum, so the incandescent lamp has a high color performance index.
The "Performance Index" marked on the lighting products is actually appropriate for CIE RA."CRI" is a broader saying, and CIE RA is an international standard color index (English: Internet: ".
In theory, the upper limit of the CIE RA is 100, defined as standardized sunlight or black body (incandescent lamp is effective black body).Some light sources have negative values, such as low -pressure sodium lamps.The fluorescent lamp is distributed in about 50 (basic type) to 98 (compound phosphorus).Typical LEDs have more than 80, and even some manufacturers claim that they can reach CRI 98.[3]
CIE RA has been questioned in its ability to predict the color of the appearance, because the measurement method is based on the appearance color model (English: Color APPEARANCE MODELS, such as CIECAM02, and the CIE heterogeneous index used in fluorescent emulator).[4] CRI is not a good indicator in visual assessment, especially when the color temperature is lower than 5000 Kelvin (K).Some new standards, such as IES TM-30, solve these problems and gradually replace the application of CRI in professional lighting design.[7] However, CRI is still commonly used for the labeling of home lighting products.
