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IES TM 12 2012

IES TM 12 2012

$16.25

IES TM-12 Spectral Effects of Lighting on Visual Performance at Mesopic Lighting Levels

Published By Publication Date Number of Pages
IES 2012 27
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This technical memorandum examines the spectral effects of lighting at low luminances typically found in nighttime conditions, focusing on visual performance, with brief discussions of roadway visual tasks, glare, chromatic effects, environmental effects, and others. Spectral effects that are known to occur primarily at higher levels (e.g., >5 cd/m2) are not addressed, and in most night-time environments there is enough ambient light to prevent true scotopic vision. This document addresses several key questions: What visual performance will be produced using different light sources? and What level of lighting from the different sources is needed in order to provide equivalent visual performance or equivalent appearance of brightness? (Note that equivalent brightness does not necessarily produce equal visual performance.) This technical memorandum provides guidance for lighting practice based on visual performance at mesopic light levels.

PDF Catalog

PDF Pages PDF Title
1 Cover
3 Copyright
8 1.0 Introduction
2.0 Known Factors in Determining Spectral Effects
10 3.0 Determining Effective Luminance
12 4.0 Calculating Effective Luminance from CIE 191
13 5.0 Effects Needing Further Research
17 Annex A – ELF Tables
21 Annex B – BASIC Code for Mesopic or Effective Luminance
22 Annex C – S/P Ratios of Common Light Sources
23 References

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IES TM 12 2012
$16.25