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CIE 200:2011

CIE Supplementary System of Photometry
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The CIE Supplementary System of Photometry, which evaluates lights in terms of comparative brightness relationship at any level, is described. The system introduces the concept of equivalent luminance to describe brightness of a light or an object at any level including mesopic levels. The system develops a photometric model to calculate brightness-related equivalent luminance by using three components of existing photometric and colorimetric quantities (photopic luminance, L, scotopic luminance, L?, and chromatic contribution to brightness, c, i.e. brightness-to-luminance ratio (B/L)) with some weighting factors in their combinations that depend on the adaptation level. The use of the system and an example of calculation are also described. Results of testing the system with experimental brightness matching data are given in an appendix. Keywords: photometry, luminance, brightness, equivalent lumninance
SDO CIE: International Commission on Illumination
Document Number 200
Publication Date Jan. 1, 2011
Language en - English
Page Count 19
Revision Level
Supercedes
Committee
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