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=== Daylight ===
Blue light is important during the day. Essentially we are blue-light detectors when it comes to keeping our internal clock well adjusted. This is especially important in the winter when blue-light levels might not be sharp enough to maintain our 24-hour clock.<ref>https://justgetflux.com/research.html</ref>
Light of around 555 nanometres is accepted as the most efficient level of light for daytime vision. But recent research has shown that we also have biological receptors for non-visual response peaking in the blue wavelength range of 446-477 nanometres, a range abundant in clear daylight. Researchers at Brown University in 2002 discovered that non-visual ganglion cells in the eye detect sky-blue light to set our internal clock.