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.
In: Technology
This is maybe too simple of an answer, but white light includes green light. White light includes all colors of the spectrum. Also have you actually tried to light your room with only one color bulb? Things always look darker.
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