Answer / rabi

When starting the lamp, a glow discharge will appear over
the electrodes of the starter. This glow discharge will
heat the gas in the starter and cause the bi-metallic
electrode to bend towards the other electrode. When the
electrodes touch, the two filaments of the fluorescent lamp
and the ballast will effectively be switched in series to
the supply voltage. This causes the filaments to glow and
emit electrons into the gas column by thermionic emission.
In the starter's tube, the touching electrodes have stopped
the glow discharge, causing the gas to cool down again. The
bi-metallic electrode also cools down and starts to move
back. When the electrodes separate, the inductive kick from
the ballast provides the high voltage (about 1 KV) to start
the lamp.

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