Outdoor lights are mainly used for outdoor illumination at night and for landscape decoration. Outdoor lights refer to the illuminations used for outdoor lighting at night, such as street lights, park lights, lawn lights, billboard lights, etc. Outdoor lights provide a safer and more attractive environment for pedestrians and drivers. They also help you find routes in foggy weather. Street lights, for example, make whole roads much clearer, thus reducing the risk of traffic accidents. Furthermore, outdoor lights, with special lighting effects, not only increased the lighting level, but also improve the commercial, night-view landscape, so that people can enjoy a pleasant visual effects, but also make the city more beautiful. However, improper installation and use of outdoor lights will make cities unnecessarily bright and increase the light pollution. So it is important to install the outdoor lights carefully and use them reasonably. For instance, we should choose energy-saving and environment-friendly lamps; Moreover, the brightness and illumination angle of outdoor lights should be set according to the actual requirements in different places. In conclusion, outdoor lights are of great significance for us, both in terms of safety and in terms of landscape decoration. We should definitely utilize them properly and not cause unnecessary waste.