How does a fluorescent starter work? | HowStuffWorks
2000-4-1 · The starter (which is simply a timed switch) allows current to flow through the filaments at the ends of the tube. The current causes the starter's contacts to heat up and open, thus interrupting the flow of current. The tube lights. Since the lighted fluorescent tube has a low resistance, the ballast now serves as a current limiter.
