The assembly transforms electrical power into a form to start and regulate the fluorescent lamp. The third major component of most electromagnetic ballasts is the capacitor. The capacitor improves the power factor, so it can utilize energy more efficiently. The electronic ballast, based on a different technology than the electromagnetic ballast, starts and regulates fluorescent lamps with electronic components rather than a core and coil assembly. While electromagnetic ballasts operate at a voltage frequency of 60 cycles per second, electronic ballasts operate at frequencies between 20,000 and 60,000 cycles per second, depending on the model.
Electronic ballasts are more expensive than electromagnetic ballasts.
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