This study has focused on the impact of fluorescent light on endocrine, neurophysiological, and subjective indices of wellbeing and stress. Results from two types of fluorescent lamps, 'daylight' and 'warm-white', were compared, each at two different levels of illuminance. Exposure lasted one day for each of the four combinations. The condition involving 'daylight' lamps with a high illuminance evoked a negative response pattern. The social evaluation of the office space went down, and at the same time the visual discomfort increased. The EEG contained less delta rhythm under the high illuminance conditions. During the day of light exposure the alpha rhythm became attenuated under the 1700 lux 'daylight' lamps. The results warrant the conclusion that fluorescent light of high illuminance may arouse the central nervous system and that this arousal will become accentuated if the lamps are of the 'daylight' type. The practical implication may be that people should not be exposed to fluorescent light of high illuminance for a prolonged period of time.
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