New studies from Germany and Hong Kong pinpoint specific sources of light pollution keeping our cities excessively bright at ...

Blue light is part of the visible light spectrum and accounts for about one-third of all light we see as humans. This type of light influences alertness, hormone production and sleep cycles.

BY ALLIE ROBINSON | BRISTOL HERALD COURIER Apr 2, 2013 Updated Apr 18, 2019 0 ...

Blue light has shorter wavelengths (around 400-500nm, as mentioned) compared to red light, which ranges from 620 to 750 nm. (Green light, which is also sometimes used for skin, falls somewhere in ...