| Definition: | set of 15 sky luminance distributions which model the sky from heavily overcast sky to cloudless sky Note 1 to entry: The relative luminance distributions are described in ISO 15469/CIE S 011, 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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