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.


global UV index

quantity developed for the public domain, for weather forecasting and climatology, which quantifies the erythemal potential (or sunburning power) of the ambient solar ultraviolet radiation, but could also be applied to other sources

Note 1 to entry: The International Global UV Index, IUV, is defined by the formula:

where Eλ(λ) is the solar spectral irradiance expressed in W⋅m−2⋅nm−1 at wavelength λ, ser(λ) is the erythema spectral weighting function, and ker is a constant equal to 40 m2⋅W−1.

Note 2 to entry: The global UV index has unit one.

Note 3 to entry: This entry was numbered 17-498 in CIE S 017:2011.

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