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A fluorescent lamp is a light source that uses electricity to make a gas inside a tube glow and produce light. It matters because it can produce light more efficiently than older incandescent bulbs, using less energy to create the same amount of brightness.
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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 Inside the lamp end of a preheat G13 lamp. In this lamp, the filament is surrounded by an oblong metal cathode shield, which helps reduce lamp end darkening.