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A fluorescent light starter is responsible for initiating the arc in the Mercury vapor inside the tube. On fluorescent tubes with filaments at each end it also provides a delay for the filaments to heat up and evaporate mercury before trying to initiate the arc.
The arc is initiated by the starter first permitting current to flow through the ballast coil which builds a strong magnetic field, then suddenly the starter opens the circuit which causes the magnetic field in the ballast coil to collapse, producing a strong inductive kickback and a brief high voltage pulse across the fluorescent tube. This high voltage pulse ionizes the mercury vapor causing it to generate an arc and emit UV light. Once the arc is conducting, the fluorescent tube bypasses both the starter and the ballast coil and neither does anything while the light remains on.
There are many different designs of starters that perform this same function in different ways (e.g. bimetallic thermal switch, electromagnet switch, electronic starter). In newer systems with an "electronic ballast" there is no separate starter, instead the electronic starter circuit is built directly into the ballast unit and cannot be independently replaced.
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∙ 6y ago
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