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Color temperature in lighting optics

Color temperature is a physical quantity used in illumination optics to define the color of a light source. That is, when a black body is heated to a temperature, and the color of the light emitted is the same as the color of the light emitted by a certain light source, the temperature at which the black body is heated is referred to as the color temperature of the light source, referred to as the color temperature. The unit is expressed in “K” (Kelvin temperature unit).

The color temperature (colo(u)r temperature) is a feature of visible light that has important applications in photography, video, and publishing. The color temperature of the light source is determined by comparing its color to the theoretical thermal blackbody radiator. The Kelvin temperature of a hot black body radiator matching the color of the light source is the color temperature of that source, which is directly related to the Planck blackbody radiation law.

Color temperature is the most common indicator of the spectral quality of the source. Generally expressed by Tc. The color temperature is defined by the absolute black body. When the radiation of the absolute black body and the radiation of the light source are exactly the same in the visible region, the temperature of the black body is called the color temperature of the light source. The low color temperature source is characterized by a relatively large amount of red radiation in the energy distribution, commonly referred to as “warm light”; after the color temperature is increased, the proportion of blue radiation in the energy distribution increases, commonly referred to as “cold light.” The color temperature of some common light sources is: standard candlelight is 1930K (Kelvin temperature unit); tungsten filament lamp is 2760-2900K; fluorescent lamp is 6400K; flashlight is 3800K; noon sunlight is 5000K; electronic flash is 6000K; blue sky is 10000K.

The color temperature of the light source is different, and the light color is different, which brings different feelings:

<3000K            Warm (with red white)            Steady, warm
3000-5000K    Middle (white)                               readily
>5000K             Cool type (with blue white)           cold


Color temperature and brightness: Under the illumination of high color temperature light source, if the brightness is not high, it will give people a cold atmosphere; under low color temperature light source, the brightness will be too high, which will give people a feeling of stuffiness. Comparison of light color: In the same space, two kinds of light sources with large color difference are used, and the contrast will have a layer effect. When the light color contrast is large, the level of light color can be obtained while obtaining the brightness level.

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