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.

To search for another term please use  "Back to the list" to return to the main page or the e-ILV.

For the complete set of terms and definitions CIE S 017:2020 can be purchased from the CIE Webshop. Members of a CIE National Committee or Associate National Committee have access to a 66,7 % discount on the purchase price of the standard.

For advice on CIE Publications contact Note the CIE Helpdesk cannot assist with technical enquiries.


CIE standard general sky

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.

Note 2 to entry: This entry was numbered 17-167 in CIE S 017:2011.

Publication date: 2020-12
Copyright © CIE 2020. All Rights Reserverd.