Lighting for Older Adults With Dementia

This will be an eighteen-hour lighting scheme that includes three modes: morning (6:00 - 12:00), afternoon (12:00 - 18:00), and evening (18:00 - 24:00). It mimics natural lighting by providing blue-enriched high-intensity lighting in the morning and neutral white medium-intensity lighting in the afternoon to maintain alertness without exerting substantial circadian effects. The biodynamic lighting will provide yellowish low-intensity lighting in the evening to minimize any circadian effect.

We will include an active placebo condition that will be a whole-day lighting scheme with constant color and brightness from morning to evening. The numbers of CCT and illuminance levels are selected based on the average room lighting