Since the light emitted by most light sources is collectively referred to as white light, the color surface temperature or correlated color temperature of a light source is used to refer to the relative whiteness of its light color to quantify the light color performance of the light source. According to Max Planck's theory, when a standard black body with complete absorption and radiation capabilities is heated, the temperature gradually increases and the luminosity changes accordingly; the black body curve (Black body locus) on the CIE color coordinates shows that the black body changes from red to orange to red. -yellow-yellow-white-white-blue-white process. The temperature at which a black body is heated to the same or close to the light color as the light source is defined as the correlated color temperature of the light source, called color temperature, and is measured in absolute temperature K (Kelvin or Kelvin temperature) as the unit (K=℃+273.15). Therefore, when the black body is heated to red, the temperature is about 527°C or 800K. Other temperatures affect the change of light color.

The more bluish the light color, the higher the color temperature; the more reddish the color temperature, the lower the color temperature. The light color of the painting light also changes with time during the day: 40 minutes after sunrise, the light color is yellower, with a color temperature of 3,000K; the midday sun is white, rising to 4,800-5,800K; at noon on a cloudy day, it is about 6,500K; the light color before sunset It is reddish, and the color temperature drops to 2,200K. The correlated color temperature of other light sources. Because the correlated color temperature is actually the evaluation value of the light color performance of the light source when the black body radiation is close to the light color of the light source, it is not an accurate color contrast. Therefore, two light sources with the same color temperature value, There may still be slight differences in the appearance of the light color. It is impossible to 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 based on the color temperature alone.

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