Physiological Effects of Environmental Lighting Conditions

Relation between Illumination Levels and Physiological Load (Part2)

Abstract

The relationship between illumination levels and physiological load has been studied by use of six steps of 1/4 log unit in the illuminance range from 100 to 1, 800lx. The other experimental conditions and methods were the same as those of the previous experiment.
Heart beat and respiration were responsive to 1/4 log unit in illuminance. It was found that physiological load was minimum in the illuminance range 500 to 600lx, and increased as the illumination level was increased or decreased from this range.
Psychologically, on the other hand, it was found that the illuminance range 800 to 900lx was the most desirable range, and desirability for illuminance decreased as the illumination level was increased or decreased from this range.