Lighting is an indispensable part of human life. Without such lighting, our modern life will become extremely dark and lonely. Lighting originated in ancient times, when humans used fire to light up the dark night. Later, oil lamps, flares, candles, electric bulbs, fluorescent tubes, LEDs and other lighting fixtures were widely used to illuminate the environment. Lighting can affect people's mental state and physical health. In a dark environment, people's mood will easily be affected by negative energy, and it will become hard to concentrate. On the contrary, bright light can make people feel energetic, improve the work efficiency, and make people full of enthusiasm and confidence. Proper lighting can be used to create a relaxing and inviting atmosphere. Different lighting colors, intensity, and angle can be used to create different visual effects. Studies have found that proper lighting can keep people in a good mood and increase their work efficiency. In addition, lighting can also reduce crime. When a certain area is well lit, it can cause people to unconsciously pay attention to their behavior, so as to reduce the occurrence of crime. Lighting is an essential part of modern life. Whether it is used indoors, outdoors, for practical or decorative purposes, or to reduce crime, lighting will always play a big role in our lives.