CIE standard general sky

set of 15 sky luminance distributions which model the sky from heavily overcast sky to cloudless sky

NOTE The relative luminance distributions are described in ISO 15469:2004/CIE S 011:2003 Spatial distribution of daylight – CIE standard general sky. The CIE standard clear sky is incorporated as a particular case, and the CIE standard overcast sky is added as a separate formula.

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