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CCT OF LIGHT
Blackbody light color and has a close relationship, the temperature of the Planck's law can be calculated corresponding to a certain temperature of blackbody spectral distribution. According to the spectral distribution under the temperature can be calculated with colorimetry formula the blackbody luminous tristimulus values and chromaticity coordinates, get a corresponding point on the chromaticity diagram. A series of different temperature of the blackbody can calculate a series of chromaticity coordinates, labelled the corresponding point on the chromaticity diagram, connect into a curved trajectory, called the planckian locus or planckian locus, as shown in figure marked a period of 2000, 45000 and so on numerical curve. When some kind of illuminant chromaticity and a temperature of blackbody color appearance at the same time, will the temperature of the blackbody referred to as the light source color temperature, color temperature for short. For example, a source of light color and black body heat to the absolute temperature of 2500 k by the light color at the same time, this light source color temperature of 2500 k, it's on the CIE1931 chromaticity diagram on the coordinates of x = 0.4770, y = 0.4137. The WWW.
Said to incandescent lamp radiation such as light source, because of its spectral distribution and blackbody spectral distribution close to, so the incandescent lamp and so on thermal radiation light source color product falls basic on blackbody trajectory, so the concept of color temperature can properly describe the color of the light. And spectral distribution of the commonly used other than incandescent light source and blackbody, far in the chromaticity diagram may not be accurate to fall on the planckian locus (but often near the tracks), for example the chromaticity diagram C is the most close to the black color when heated to 6774 k, so the light C correlated color temperature of 6774 k.
Said to incandescent lamp radiation such as light source, because of its spectral distribution and blackbody spectral distribution close to, so the incandescent lamp and so on thermal radiation light source color product falls basic on blackbody trajectory, so the concept of color temperature can properly describe the color of the light. And spectral distribution of the commonly used other than incandescent light source and blackbody, far in the chromaticity diagram may not be accurate to fall on the planckian locus (but often near the tracks), for example the chromaticity diagram C is the most close to the black color when heated to 6774 k, so the light C correlated color temperature of 6774 k.
