Abstract
Fluorescent illumination has become common, but its alleged effects on behavior are still controversial. This experiment was designed to determine whether warm white, cool white, and full-spectrum fluorescent spectra at approximately equal illuminances differentially affect performance on simple verbal and quantitative tasks, salary recommendations, rated attractiveness and friendliness of others, judged room attractiveness, estimated room size, and self-reported pleasure and arousal. The results showed no significant differences among the three lighting types on any of the dependent measures. A subsequent power analysis indicated that if differences actually do exist, they are quite small. Cool white or warm white lamps are recommended because they are much less expensive than full-spectrum lamps.
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