Fluorescent Ignition
Filament electrode at each end, starter unit needed
as mains V too smol to ionise vapour w/ cold electrodes,
Tube switched on, gas (Argon) in starter switch unit conducts, heats bimetallic strip, making it bend, switch closes; current through starter unit incr. enough to heat
filament electrodes, bimetallic switch closes, gas in starter unit stops conducting, bimetallic strip cools, switch opens,
mains V acts between electrodes hot enough for ionisation