Yellow light can be used as the color for car fog lights. The light emitted by car fog lights is yellow, which is the best choice made by scientists after careful research.
1, There is no need for eye-catching red light because the fog light must have a scattering effect in order to scatter the beam of light as far forward as possible into larger clusters of light, so that oncoming drivers can see the target clearly without feeling dazzling. The scattering intensity of yellow light is 5 times that of red light. It is obvious that using yellow light as the light color for car fog lights is much more efficient than using red light.
2, Green light, blue light, and purple light have a stronger scattering effect than yellow light, but the reason for using yellow light as fog light is as follows: green light has long been used as a "safe" and "passable" indicator light. As for blue and purple light, although their wavelengths are short and their scattering effect is strong, they have a congenital weakness, which is that the light color is darker, and their colors are very similar to the sky color in the evening, dawn, or cloudy days, and heavy fog is most likely to diffuse the earth during such times. Under the background of such a large environment, using blue or purple light again clearly does not meet the requirements of signal signs.