Circadian Lighting According to a growing body of academic research, the natural cycle of day and night is essential to maintaining our health and well-being, and a lack of daylight during the day and the growing prevalence of blue-rich light at night is disruptive to a person’s immune response, metabolic function, cognitive performance and even genetic expression. Lighting levels and quality are interpreted by the suprachiasmatic nucleus (SCN) in the eye, which calibrates da