First, it is necessary to know the color and wavelength of light

Light is one of the electromagnetic waves, and the spectrum includes infrared, ultraviolet, and visible light, etc. Among them, visible light is composed of seven colors of light, namely red, orange, yellow, green, cyan, and blue-violet. The color of light is different, and the wavelength is also different. Among them, red light has the longest wavelength and purple light has the shortest wavelength. However, as the color of the lamp for lighting, it is not the longest wavelength that is most suitable. The wavelength range of yellow light is 570-600 nanometers, which is in the relatively sensitive band of the human eye, and the warm color light will not stimulate the eyes. For streetlights, yellow light is the most ideal choice.

It is also necessary to consider the actual effect

There are many types of streetlight sources, and it is necessary to fully consider the cost performance ratio when choosing. After comparative analysis, the high-pressure sodium lamp was finally chosen. High-pressure sodium lamp is a kind of gas source with high luminous efficiency, which is an arc discharge lamp with high pressure sodium vapor, and the wavelength range of the light wave it emits is in the yellow light band of visible light, so in our view, the light of the high-pressure sodium lamp is yellow.

In addition, the high-pressure sodium lamp has high luminous efficiency, low electricity consumption, long service life, strong fog penetration ability and does not attract insects. It can not only ensure that people can see clearly but also make the light soft, which can effectively reduce the occurrence of traffic accidents, so it is very suitable to be used as the source of streetlights.