Blue light

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.