The e-ILV provides free access to all the terms and definitions contained in the international standard CIE S 017:2020 ILV: International Lighting Vocabulary, 2nd edition.
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direct solar irradiance
irradiance produced by direct solar radiation on a horizontal surface on the Earth
Note 1 to entry: The direct solar irradiance is expressed in watt per square metre (W·m−2).
Note 2 to entry: This entry was numbered 17-322 in CIE S 017:2011.