Fluorescent lights are a type of artificial lighting that uses electricity to excite mercury vapor, producing ultraviolet light. This ultraviolet light then interacts with a phosphor coating on the inside of the bulb, creating visible light. They are commonly used in homes, offices, and schools due to their energy efficiency and long lifespan compared to traditional incandescent bulbs. These lights come in various shapes and sizes, including tube lights and compact fluorescent lamps (CFLs). Fluorescent lights consume less energy, which can lead to lower electricity bills. However, they contain small amounts of mercury, making proper disposal important to avoid environmental contamination.