Since most of the light emitted by the light source is collectively referred to as white light, the color table temperature or the correlated color temperature of the light source is used to refer to the relative whiteness of the light color to quantify the light color performance of the light source. According to Max Planck's theory, a standard black body with complete absorption and radioactivity is heated, and the temperature gradually increases. The black body locus on the CIE color scale shows that the black body is red-orange-- - Yellow - yellow white - white - blue and white process. The temperature at which the black body is warmed to the same or close to the light source is defined as the correlated color temperature of the light source, which is called the absolute temperature K (Kelvin or Kelvin) (K=°C+273.15). Therefore, when the black body is heated to a red color, the temperature is about 527 ° C, that is, 800 K, and other temperatures affect the color change.
The more blue the light color, the higher the color temperature; the lower the color temperature, the lower the color temperature. The color of the light in the day also changes with time: 40 minutes after sunrise, the light color is yellower, the color temperature is 3,000K; the midday sun is white, rising to 4,800-5,800K; the cloudy day is about 6,500K at noon. The color of the light is red before sunset, and the color temperature drops to 2,200K. The correlated color temperature of other light sources, because the correlated color temperature is actually the black body radiation approaching the light source color, the evaluation value of the light source color performance is not an accurate color contrast, so the two light sources with the same color temperature value, There may be some differences in the appearance of the light color. The color temperature alone cannot understand the color rendering ability of the light source to the object, or how the color of the object is reproduced under the light source.
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Correlated color temperature for different light source environments
Northern Clear Sky 8000-8500k
Cloudy 6500-7500k
Summer noon sunshine 5500k
Metal halide lamp 4000-4600k
Afternoon daylight 4000k
Cool color camp light 4000-5000k
High pressure mercury lamp 3450-3750k
Warm color camp light 2500-3000k
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