Contrasting dynamic light scenarios in an operational office: Effects on visual experience, alertness, cognitive performance, and sleep

In this field study, we tested the effects of dynamic light scenarios and personal illuminance on visual experience, sleepiness, cognitive performance sleep in an operational office. Two scenarios, different timing but with equal luminous exposure, were against a reference scenario counterbalanced crossover design. Frequent assessments alertness, showed that both comfort was slightly lower compared to constant scenario. Additionally, sleepiness lowest brighter timed around noon, whereas task actual not significantly affected. The measured did predict performance, yet variation these illuminances positively relate onset duration. When studying or implementing aiming deliver integrative lighting, spatial behavioral context should be considered as well.