A fluorescent lamp is a gas-discharge lamp that uses electricity to excite mercury vapor. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light which is like towards daylight, high output and flicker-free, ideal for video recording and digital cameras shots photography. A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp. Lower energy cost typically offsets the higher initial cost of the lamp. The compact fluorescent lamp design also popularly used as an energy-saving alternative in homes like incandescents