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 helpdesk@cie.co.at. Note the CIE Helpdesk cannot assist with technical enquiries.
Lambert's cosine law
Lambert's law for a surface element whose radiance or luminance is the same in all directions of the hemisphere above the surface
Note 1 to entry: Lambert's cosine law can be expressed by
where
Note 2 to entry: This entry was numbered 845-04-56 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-632 in CIE S 017:2011.