The internal electrodeless lamp, induction lamp, or electrodeless induction lamp is a gas-discharge lamp in which an electric or magnetic field transfers the power required to generate light from outside the lamp envelope to the gas inside. This is in contrast to a typical gas discharge lamp that uses internal electrodes connected to the power supply by conductors that pass through the lamp envelope. Eliminating the internal electrodes provides two advantages:
- Extended lamp life (internal electrodes are the most limiting factor in lamp life, since their metal content will get sputtered onto the lamp ends every time they are turned on)[citation needed]
- Ability to use higher-efficiency light-generating substances that would react with internal metal electrodes in conventional fluorescent lamps[citation needed]
Two systems are common: plasma lamps, in which electrostatic induction energizes a bulb filled with sulfur vapor or metal halides, and fluorescent induction lamps, which are like a conventional fluorescent lamp bulb that induces current with an external coil of wire via electrodynamic induction.
https://en.wikipedia.org/wiki/Electrodeless_lamp
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