Reasonable Lighting Factors for Work Environment with VDT Tasks

概要

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This paper presents a proposal to design factors for a reasonable lighting environment in Visual Display Terminal(VDT)work, by monitoring changes in the lighting environment by general illumination and partial illumination as a factor of the working environment. We also considered that this factor affects productively and workload from an experimental approach. Since we think that it is not enough to evaluate a lighting environment only by subjective appraisal, we used brain waves as a physiological index for evaluating human mental activity objectively. The evaluation index used in the experiment were obtained by measuring working efficiency and working quality in VDT work, mental changes (stability)recorded by an electroencephalograph (EEG), and determined the workload by a survey of subjective symptoms and by measuring eye fatigue. The results enable us to derive a relationship between reasonable lighting environment and illuminance. The results show the following: 1)When the partial illumination was given to subjects, it was shown to effect their concentration on work and mentally stabilize at the ratio of surround illuminannce to horizontal illuminance was about 0.05. 2)When the ratio of surround illuminance to horizontal illuminance was the same, the effect showed remarkable at the ratio of vertical illuminance to horizontal illuminance was lower.
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