Outdoor lights are essential for people's daily life. It is the night lights that can effectively illuminate the darkness. Outdoor lights are generally installed at street corners, squares, schools, villas, farms and other places outside buildings. Outdoor lights can effectively ensure the safety of people's travel at night by providing light. The selection of outdoor lights should also have different local lighting effects. For example, a large park requires more scattered lighting sources, while a small square requires concentrated lighting. The brightness of outdoor lights can also be adjusted according to the needs of different places. It can meet peoples needs for light while also reducing light pollution. The installation of outdoor lights should be measured accurately. Generally, wall mounted outdoor lights are more energy-saving and fast-installed, while ceiling mounted outdoor lights can have better light-effect. In addition, waterproof outdoor lights are encouraged for outdoor environment. By better selecting and installing the right outdoor lights, it can ensure the lighting effects, as well enhance the safety of outdoor environment. Nowadays, outdoor lights illuminate the night and become a practice for safer city.