Skip to main content
cie

e-ILV

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.

17-24-067

regular transmittance

τr

quotient of the regularly transmitted part of the (whole) transmitted flux and the incident flux

Note 1 to entry:
Transmittance, τ, is the sum of regular transmittance, τr, and diffuse transmittance, τd: τ = τr + τd.

Note 2 to entry: The regular transmittance has unit one.

Note 3 to entry: This entry was numbered 845-04-61 in IEC 60050-845:1987.

Note 4 to entry: This entry was numbered 17-1079 in CIE S 017:2011.

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