The night lights, also known as night lighting, are luminosity sources installed at night to lighten the darkness of the night, making it easier for human beings to travel and work outdoors at night. Night lights can reduce the risk of accidents and can also give people a sense of security. There are many kinds of night lights, for example, LED night lights, solar night lights, street lights and so on. LED night lights, with low energy consumption, are very popular at present. These lighting products are available in a wide variety of shapes, sizes, colors, and can be used for different purposes. For example, colored LED lights and flashing lights can be used for decoration, while night lights on the ground or walls can be used for illumination purposes. Night lights can be used in a variety of places, such as parks, outdoor gardens, backyards, streets, pathways and so on. They can greatly enhance the night scenery and the quality of night life. But when using night lights, we should pay attention to the problem of light pollution. It can cause harm to peoples health and affect the environment and night. Therefore, when using night lights, we should choose lamps with high energy efficiency, moderate illumination intensity and reasonable design. In summary, the use of night lights brings us convenience, but it also has potential risks. So when using them, we should pay attention to reasonable use and avoid potential risks as much as possible.