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Definition:

The color variation is measured by the standard deviation of color matching (SDCM). A color difference of 1 SDCM unit is not visible, 2 to 4 units is barely visible, and 5 or more units is readily noticeable. The lower the number of  SDCM, the smaller the color shift.

Explain:

sdcm

CIE 1931 diagram with the 1 to 7 SDCM

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【Lighting Knowledge】SDCM
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