Gas discharge lamps are a type of lighting that produces light by passing an electric current through a gas. This process excites the gas molecules, causing them to emit light. Common types of gas discharge lamps include neon lamps, fluorescent lamps, and high-intensity discharge (HID) lamps. They are often used in street lighting, commercial spaces, and decorative applications. These lamps are known for their energy efficiency and long lifespan compared to traditional incandescent bulbs. However, they may require a ballast to regulate the electrical current. Gas discharge lamps can produce a range of colors depending on the gas used, making them versatile for various lighting needs.