So, people see best in the wavelength around 500nm which is a green/blue color. Why aren’t car headlights this color to improve visibility? Why can’t you buy headlight bulbs that emit bright green light? A white light with a green filter would just make it more dim, but on headlights you want brightness.
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> people see best in the wavelength around 500nm which is a green/blue color.
Our eyes are most sensitive to that wavelength but our colour vision obviously needs others. Saying we see “best” is not accurate, because vision is more than just brightness. There have been studies on the safety of things like street lights, and those yellow, sodium-based bulbs are worse, even at the same brightness, just because they shine in only one colour.
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