Night lights are a kind of projected lighting products that are used to emit light at night to decorate the environment. It can be used indoors or outdoors. Night lights are usually composed of two parts, a light source and a patterned/plain cylinder cover. Common light sources include LED lamps and halogen lamps. The cylinder cover is usually made of transparent acrylic material to prevent glare. In addition to these two components, some night lights also have base plates and decorative accessories. Indoor night lights are usually used to decorate the living environment, such as bedrooms, living rooms and studies. The patterns of indoor night lights include cartoon animation, animal patterns, and replica patterns. Outdoor night lights are used to decorate the outdoor environment, such as balconies and gardens. The most common outdoor night lights are imitation castle walls, bells, birds and various animal shapes. Night lights also have various functions. For example, some night lights are equipped with music, moving and emotion functions to provide further enjoyment for people. Night lights are not only beautiful, but also have energy-saving and environmental protection functions, which can make the night environment romantic and bring a peaceful night.