Language selection

Government of Canada / Gouvernement du Canada

Search

Procedure to determine background luminance for use in ESI and visual performance methods

From National Research Council Canada

Download
  1. (PDF, 1.0 MiB)
AuthorSearch for:
FormatText, Article
SubjectLighting; lighting; luminance; visibility; adaptability
Abstract
Two major factors determine the visibility of common objects: the luminance contrast of the object detail with respect to its immediate background and the adaptation level of the visual system. CIE Publication No. 19 chooses the term task luminance to characterize an observer's state of adaptation and then uses this factor to describe a task in connection with all operations carried out in the visual performance framework of methods. The imprecision and poor understanding of this parameter severely restrict the accuracy of the visual performance methodology in lighting energy conservation and design. Experimental procedures are proposed for accurate measurement of background luminance for typical office and school tasks.
Publication date
In
  • Journal of the Illuminating Engineering Society 8, no. 1 (October 1978): 15–18.
LanguageEnglish
Peer reviewedYes
IdentifierDBR-P-818
NRC numberNRCC 17137
NRC-IRC-4368
NPARC number20359121
Export citationExport as RIS
Report a correctionReport a correction (opens in a new tab)
Record identifierfa317d05-a1b6-431f-b50a-445dfba1bd35
Record created2012-07-20
Record modified2024-03-14
Date modified: