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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> So, people see best in the wavelength around 500nm which is a green/blue color
This is an extreme misunderstanding of the fact that humans are better at discerning between shades of green than of other colors. A human would be able to see someone wearing all green against a slightly different green background, or at least see them better than someone wearing all red against a slightly different red background. But, that’s only true if they are being illuminated with white light. If they were being illuminated with pure green light, the green person against the green background would be nearly impossible to see, and the red person against the red background would be literally impossible to see. By using fewer wavelengths of light, our eyes would have less information and would differentiate between things worse.
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