Compact fluorescent lights are used in place of incandescent lights, but use one-fifth or one-third of the electrical power. They also last about ten times longer, making them very efficient for lighting rooms.
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They are known as CFL bulbs. It stands for Compact Fluorescent Lamps.
Anything that excites the gas in a fluorescent will make it light. Static electricity from the carpet will cause compact fluorescent to light.
A compact fluorescent lamp (CFL), also called compact fluorescent light, energy-saving light, and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent lamp; some types fit into light fixtures formerly used for incandescent lamps. The lamps use a tube which is curved or folded to fit into the space of an incandescent bulb, and a compact electronic ballast in the base of the lamp.
An Energy Star qualified compact fluorescent light bulb can save you around $30 over it's lifetime, paying for its self in about 6 months.
The brightest compact fluorescent bulb is of over 100 lumens or higher outputs at higher drive currents.