High-intensity discharge (HID) lamps are a type of electric light that produces bright illumination by passing an electric current through a gas. These lamps are commonly used in outdoor lighting, such as streetlights and stadiums, due to their high efficiency and long lifespan. HID lamps come in various types, including metal halide, high-pressure sodium, and low-pressure sodium, each offering different color temperatures and brightness levels. HID technology works by creating an arc between two electrodes within a gas-filled bulb. This arc generates a significant amount of light, making HID lamps much brighter than traditional incandescent bulbs. While they require a warm-up period to reach full brightness, their energy efficiency and durability make them a popular choice for both commercial and residential applications.