Which process is used in electric lamp?

Electric lamps primarily use the process of incandescence or fluorescence to produce light. In incandescent lamps, electricity heats a tungsten filament until it glows, emitting light. In fluorescent lamps, electricity excites Mercury vapor, producing ultraviolet light that then causes a phosphor coating inside the lamp to emit visible light. LED lamps, another type, use electroluminescence, where a semiconductor emits light when an electric current passes through it.