When the color of the light source is the same as the color of the black body heated to a certain temperature, it becomes the color temperature of the light source, or color temperature for short. Kelvin.
If we heat an iron block, the color of the light of the block has a fixed relationship with the temperature of the block. As the temperature rises, the iron begins to change gradually from dark red to red to light red to orange and yellow to white. Experiments show that color temperature has nothing to do with luminescent materials, only with temperature. The color that corresponds to a certain temperature is called the color temperature.
The lower the color temperature, the redder the light color, the higher the color temperature, the more purple the light color, the white color temperature is 5000K ~ 6000K (the temperature of the sun's surface), is the most suitable color temperature for human eyes.
Low color temperature light source irradiation, can make red more colorful; Adopt medium color warm light source irradiation, make blue have cool and refreshing feeling; The use of high - color light source irradiation, so that the object has a cold feeling.
The illuminant that gives off light because of heat, be like incandescent lamp, the iron that gives off light, the sun, the surface temperature is much higher, the color temperature that gives off light is much higher. However, some discharge lamps, such as metal halide lamps and fluorescent lamps, do not emit light at high temperature, so there is no corresponding relationship between surface temperature and color temperature.