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
People want to be able to see all kinds of objects, even those that don’t reflect green light very well. White headlights do that best; if you need more light then just make them brighter.
Another big issue is that we use traffic signals, and green tells people to go. If headlights were green, especially if it was a somewhat rare option, it would be very dangerous as oncoming traffic could be confused as a signal during a red light.
Latest Answers