PL lamps are plug-in fluorescent lamps and became widely known since Philips marketed its PL series non-integrated compact fluorescent lamps including PL-L, PL-C, PL-T, PL-S, PL-R, and PL-Q.
PL-C stands for plug-in cluster fluorescent lamps.
PL-R stands for radius model (round socket) plug-in lamps.
Other versions of the lamp come in triple and quad tubes and some can be used for more than just lighting, such as germicidal lamps – lamps used for disinfection. PL bulbs are pin-based, with either two or four pins, and installing them requires a pin-based lighting fixture
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