This study was conducted to evaluate the physiological and psychological effects of illuminance in an office space during the performance of monotonous tasks.
A series of experiments were carried out in an experimental room that simulated anactual office space. The experimental factor was the illuminance on the working plane, and there were four illuminance levels increasing in geometric progression: 200, 500, 1250 and 3125lx. The physiological and psychological measurements used were electroencephalogram (EEG), finger photoelectric plethysmogram (PTG), heart rate, kwansei-gwakuin sleepiness scales (KSS) etc.
1) Analysis of EEG and KSS showed that the subjects' activation levels remained higher under the conditions of 500lx and 1250lx.
2) Analysis of PTG and heart rate showed that the subjects were relaxed under conditions of 5001x and 1250lx.
The results show that to a certain extent low or high illuminance levels are not suitable for the performance of the VDT vigilance task.
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