Lighting. Nonvisual effects.
研究发现环境光暗周期调节人体激素节律，光照的非视觉效应可用于治疗情感障碍，傍晚强光疗法可能通过影响褪黑素节律系统改善抑郁。
The rhythmic variations of several hormones in man have been shown to be regulated by changes in the environmental light-dark cycle. In experiments with environmental lighting conditions the seasonal variation and the latitude of the study may influence the results. The nonvisual effect of light has recently been used for treating affective disorders. The clinical improvement of some depressed patients from the use of evening bright-light therapy may be related to an effect of light on the melatonin-rhythm generating system.