High-intensity discharge (HID) refers to a type of lighting technology that produces bright light by passing an electric current through a gas. This process creates an arc between two electrodes, which excites the gas and generates light. HID lamps are commonly used in applications like street lighting, automotive headlights, and stadium lighting due to their high efficiency and brightness. There are several types of HID lamps, including metal halide, high-pressure sodium, and mercury vapor lamps. Each type has its own characteristics, such as color temperature and energy efficiency, making them suitable for different uses. HID lighting is known for its long lifespan compared to traditional incandescent bulbs.