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.


arc discharge, <in a gas or in a vapour>

electric arc, <in a gas or in a vapour>

electric discharge characterized by a cathode fall which is small compared to that in a glow discharge

Note 1 to entry: The emission of the cathode results from various causes (thermionic emission, field emission, etc.) acting simultaneously or separately; secondary emission plays only a small part.

Note 2 to entry: This entry was numbered 845-07-16 in IEC 60050-845:1987.

Note 3 to entry: This entry was numbered 17-54 in CIE S 017:2011.

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