A High-Intensity Discharge Lamp (HID lamp) is 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. They come in various types, including metal halide, high-pressure sodium, and mercury vapor lamps, each offering different color temperatures and brightness levels. HID lamps work by creating an arc between two electrodes within a gas-filled bulb. This arc generates a significant amount of light, making them much brighter than traditional incandescent bulbs. While they consume more energy than some modern lighting options, such as LEDs, their ability to illuminate large areas makes them a popular choice for commercial and industrial applications.