The color rendering ability of a light source to an object is called color rendering, which is compared with the external color of an object under a reference to the same color temperature or a reference light source (incandescent or painted light). The spectral content of the light emitted determines the color of the light source, but the same color can be formed by many, a few or even only two monochromatic light waves longitudinal, the color rendering of each color is also very different. Light sources with the same color have different spectral composition, and light sources with broader spectral composition are more likely to provide better color rendering quality. When there is little or no main wave reflected by the object in the light source spectrum, the color shift will be obvious. The greater the chromatic aberration, the worse the color rendering of the light source.
To highlight the specific color, the performance of a beautiful life can be used to enhance the color effect by adding color. The use of low color temperature light source irradiation, can make the red more bright; the use of medium color temperature light source irradiation, so that blue has a cool feeling; the use of high color temperature light source irradiation, so that the object has a cold feeling.
The color rendering index of sunlight is defined as 100, and the color rendering index of incandescent lamp is very close to sunlight, so it is regarded as an ideal reference light source. In order to measure the color rendering index of the light source, the average deviation value Ra20-100 is taken as the maximum, and the greater the average color difference, the lower the Ra value. Light sources less than 20 are usually not suitable for general purposes.
General application of index (Ra), grade, chromaticity
90-100, 1A, the places requiring precise color contrast.
80-89, 1B, the places needing correct color judgement.
60-79, 2 , the places requiring moderate color rendering
40-59, 3, low color rendering requirements, low color areas.
20-39, 4, the place where poor color rendering has no specific requirements.
Post time: Aug-12-2019