Why are fluorescent lights better?

Fluorescent lamps are the most energy efficient form of lighting for households. Fluorescent lamps, including compact fluorescents (CFLs), use only one quarter to one fifth as much energy, therefore producing only about one quarter of the greenhouse gases, compared to incandescent bulbs to provide the same light level (if powered by coal).

They are ideal for areas where lighting is required for long periods of time, such as the living room and kitchen, and for security lighting.