The form of street lights is different, but the most common, the most practical function is lighting. Therefore, the street lights set on the side of the road are white, and the earlier styles may be orange -yellow. This may be incandescent lamps. The incandescent lamp is a relatively early lamp. It contains a tungsten wire. When the current is through tungsten wire, the electrical energy is converted into light energy and thermal energy. But we use street lights mainly using light energy, and heat energy is a loss. The LED light that was later invented solved this problem, it was cold light. As the name suggests, the cold light does not produce heat, and the energy is fully used. Another advantage of the cold light is that the strength of the light is relatively large, and the brightness is more suitable for use.

In addition to the function of lighting, the street lights also have the purpose of decorating and beautifying, so there are various street lights of various shapes and colors. Many of them are the shapes of flowers, as well as small animals, and others, all are chic, some are elegant and quaint, some are lively and cute.