Blue light, or "High Energy Visible" light (HEV light) is blue to violet light in the 400 - 500 nanaometre range part of the visible light spectrum. There is storng evidence that it interferes with human circadian rhythms and suppresses melatonin production if viewed at greater than a mere 8 Lux at night* and is suspected of being a cause of age-related macular degeneration. Widespread sources of blue light tend to be LED screens, compact fluourescent lamps and many automobile headlights.
Research is starting to indicate that modern lighting techniques might damage elements of the human eye and affect our health in other ways.
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