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Improving indoor lighting conditions at the workplace has the potential to support proper circadian entrainment of hormonal rhythms, sleep, and well-being. We tested the effects of optimized dynamic daylight and electric lighting on circadian phase of melatonin, cortisol and skin temperatures in office workers. We equipped one office room with an automated controller for blinds and electric lighting, optimized for dynamic lighting (=  Test room ), and a second room without any automated control (=  Reference room ). Young healthy participants (n = 34) spent five consecutive workdays in each room, where individual light exposure data, skin temperatures and saliva samples for melatonin and cortisol assessments were collected. Vertical illuminance in the  Test room  was 1177 ± 562  photopic lux (mean  ± SD) , which was 320 lux higher than in the  Reference room  ( p  &lt; 0.01). Melanopic equivalent daylight (D65) illuminance was 931 ± 484 melanopic lux in the  Test room  and 730 ± 390 melanopic lux in the  Reference room  ( p  &lt; 0.01). Individual light exposures resulted in a 50 min earlier time of half-maximum accumulated illuminance in the  Test  than the  Reference room  ( p  &lt; 0.05). The melatonin secretion onset and peripheral heat loss in the evening occurred significantly earlier with respect to habitual sleeptime in the  Test  compared to the  Reference room  ( p  &lt; 0.05). Our findings suggest that optimized dynamic workplace lighting has the potential to promote earlier melatonin onset and peripheral heat loss prior bedtime, which may be beneficial for persons with a delayed circadian timing system.

Optimized office lighting advances melatonin phase and peripheral heat loss prior bedtime