Fluorescent lamp
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A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, to pr
Linear fluorescent lamps illuminating a pedestrian tunnel
Top: two non-integrated compact fluorescent lamps. Bottom: two fluorescent tube lamps. Both types require a ballast in the light fixture. A matchstick, left, is shown for scale.
Typical F71T12 100 W G13 bi-pin lamp used in tanning beds. The (Hg) symbol indicates that this lamp contains mercury. In the US, this symbol is now required on all mercury-containing fluorescent lamps.
A "tombstone" style lamp-holder for T12 and T8 G13 bi-pin fluorescent lamps
Compact fluorescent lamp
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A compact fluorescent lamp, also called compact fluorescent light, energy-saving light and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent light bulb; some types fi
Fluorescent lamp
…because, among other things, they require a ballast to regulate current through the lamp, but the initial cost is offset by a much lower running cost. Compact fluorescent lamps (CFL) made in the same sizes as incandescent lamp bulbs are used as an energy-saving alternative to incandescent lamps in homes. In the United States…
The tubular-form CFL is one of the most popular types in Europe.
CFLs of varying power: 105W, 36W and 11W
Philips SL*18, an early CFL
A helical integrated CFL, one of the most popular designs in North America since 1995, when a Chinese firm marketed the first successful design