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.


tilt in application, <of a luminaire>


angle between a defined datum axis on the luminaire and the horizontal when the luminaire is mounted for field use

Note 1 to entry: The defined datum axis can be any feature of the luminaire but it will usually relate to a feature that is nominally aligned with the horizontal such as an axis through the luminous opening or an axis through an array of LEDs or a fixing spigot entry axis.

Note 2 to entry: The tilt in application is the actual tilt of the luminaire when it is mounted for field use and should not be confused with "tilt normal in application" or "designed attitude" (see CIE 121 The Photometry and Goniophotometry of Luminaires).

Note 3 to entry: The tilt in application is expressed in radian (rad) or degree (°).

Note 4 to entry: This entry was numbered 17-1317 in CIE S 017:2011.

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