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.


Bezold–Brücke phenomenon

change in hue produced by changing the luminance (within the range of photopic vision) of a colour stimulus while keeping its chromaticity constant

Note 1 to entry: With certain monochromatic stimuli, hue remains constant over a wide range of luminances (for a given condition of adaptation). The wavelengths of these stimuli are sometimes referred to as "invariant wavelengths".

Note 2 to entry: With increasing intensity, below 510 nm hues shift more towards blue, and above 510 nm hues shift more towards yellow (reds become yellower with increasing brightness).

Note 3 to entry: This entry was numbered 845-02-39 in IEC 60050-845:1987.

Note 4 to entry: This entry was numbered 17-86 in CIE S 017:2011.

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