Aviation obstruction lights are mainly high-altitude warning lights, which are usually installed in high-rise buildings. In foggy and rainy weather, they are mainly used to remind the height and type of high-altitude flying objects, so that they can dodge early.
The main reason is that air molecules have different degrees of light scattering at different frequencies. The higher the frequency, the stronger the light scattering, and the lower the light scattering, the less intense it. Because the frequency of red light is visible, but the visible light is low, it is weakly scattered and easy to spread through the atmosphere to far away, so that even in foggy weather, you can see the red light from far away Signal. Therefore, all warning signals, including red lights prohibiting cars from passing, aviation obstruction lights warning night planes, and warning signs used on construction sites and blasting sites, are all red in order to arouse people's vigilance as early as possible.
As for white light, it is a mixed light of red, orange, yellow, green, cyan, blue, and purple. It has a large light intensity and can easily attract people's attention. Therefore, some aviation obstruction lights use white light.