The non-visual effects of light on human health.

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Have you ever had the experience of not being able to fall asleep after look at your phone for a long time? The blue light that your smart phone emits is not only bad for your vision, but it's bad for your brain too. Evidence is accumulating that depression, anxiety, and sleep quality may be associated with 480nm blue light overuse.

We can divide the effect of light on people into two types: Visual effect(recognition of colors and brightness) and Non-visual effects(control of melatonin levels relating to circadian rhythm, physiological effects and sleep/wake cycle). Melanopic sensitivity located at 480nm of light spectrum controls the suppression & secretion of the melatonin hormone. By delaying the release of melatonin, the light pushes back bedtime and leads to less restful sleep.

Americans spend on acerage 86.9% of time indoors. plus another 5.5% inside vehicles.(Klepeis et. al., J. Exposure Analysis and Environmental Epidemiology, 2001). This means that we spend most of our time with artificial Light and advanced circadian lighting will play an increasingly important role in our lives. Fine-tuned spectra for circadian lighting has been widely used in Barrina led linear lighting series.

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