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.


luminance coefficient in diffuse illumination

quotient of the luminance of a field and the illuminance on the plane of that field, for a diffused lighting and an observation direction forming a grazing angle with the road surface

Note 1 to entry: The luminance coefficient in diffuse illumination is expressed in candela per square metre per lux (cd⋅m−2⋅lx−1).

Note 2 to entry: This entry was numbered 17-713 in CIE S 017:2011.

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