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Circadian Lighting


The preservation of the night—and of the day—is very important to the maintenance of our health and well-being,” says Deborah Burnett, explaining that our increasing lack of daylight during daytime hours and the growing prevalence of blue-rich light at night (from glowing screens and other sources) disrupts metabolic function, immune response, cognitive performance—even genetic expression.

Benya and Burnett outlined “the monetary and human costs of circadian desynchronization,” from lowered productivity and increased workplace accidents caused by fatigue to the link between depressed melatonin levels and increased cancer risk. They also explored the benefits of daylighting and “circadian adaptive lighting”—lighting that emulates or complements nature’s cycles of light and dark, as well as the changes in color quality and direction that the sun’s light waves exhibit over the course of a day.   

“This is a very exciting time to be a lighting designer,” says Burnett, explaining that the growing body of research in photobiology poses both a challenge and an opportunity for those in the lighting field: to “go beyond aesthetics, and actually enhance human health and function.”

The possibilities range from the simple to the technologically advanced, from lowering wayfinding lights (so as to avoid exciting certain cells in the eyes that cue wakefulness) to creating dynamic fenestration technologies that integrate daylighting with electrical lighting, automatically adjusting brightness and color balance in harmony with circadian fluctuations. The applications vary too, from helping patients reduce hospital stay times or optimizing students’ learning to minimizing the photo biological impact of outdoor lighting to help restore ecosystems.

ChromaWhite VCCT solutions are designed to contribute to a circadian adaptive lighting solution, and provides not only colour tunable solutions by changing the CCT, but the spectral distribution is closer to normal daylight variation, with considerably lower ratios of blue to red (circadian to photopic) when warmer light (around 2700K) is delivered than other LED tuneable systems. This is an essential consideration for superior circadian solutions. 

View the whole PDF on Circadian Adaptive Lighting and Photo Biological responses.


Photo Biological

Colour tunable

colour tuneable

ChromaWhite, Ciradian Lighting, LED technology