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What do the various CIE illuminant designation mean (D55, D65, etc)? How are they related to each other and to CCT?

April 26, 2017CCT CIE D65 illuminant mean various

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What do the various CIE illuminant designation mean (D55, D65, etc)? How are they related to each other and to CCT?

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There is no simple correlation. On a clear day, the CCT of daylight will increase as the sun gets higher in the sky. However, other variables such as season, location, and weather conditions will also play a role.