incandescent light, the CCT for an incandescent light is simply its unadjusted temperature, derived from comparison to a black-body radiator.

The Sun

The Sun closely approximates a black-body radiator. The effective temperature, defined by the total radiative power per square unit, is 5,772 K. The color temperature of sunlight above the atmosphere is about 5,900 K.

The Sun may appear red, orange, yellow, or white from Earth, depending on its position

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