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The D65 standard light source is also known as the international standard artificial sunlight (Artificial Daylight) with a color temperature of 6500K. In addition to the D65 standard light source that must be included in the multi source standard light source box, there are also TL84, CWF, UV, F, A, U30, HOR and other light sources.
The standard light source refers to simulating the artificial light source under various environmental light, so that the production factory or laboratory can also get the lighting effect which is basically consistent with the light source under these specific environments. Standard light sources are usually installed in the standard light source box, which is mainly used to detect the color deviation of the items.