JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN
Online ISSN : 1349-838X
Print ISSN : 0019-2341
ISSN-L : 0019-2341
Relation Between Lighting Conditions and the Subject's Concentration Levels
Ratio of Ambient Illuminance to Task Illuminance
Mika SakaueYukio AkashiChie UmenoAkihiro Yagi
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1997 Volume 81 Issue 5 Pages 385-390

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Abstract

We compared the concentration levels of subjects under several lighting conditions in which the ratio of the task illuminance to the ambient illuminance was varied.In order to evaluate the subjects' levels of concentration, subjective appraisals and measurements of the subjects' lambda responses (one of the brain's responses) were carried out. The results showed a close correlation between the subjective appraisals and the measured lambda responses.We found that lighting in which the ratio of the ambient illuminance to the task illuminance was from 0.02 to 0.3 provided the optimum conditions for concentration.

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© The Illuminating Engineering Institute of Japan
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