The electronic ballast is a device generating high frequency energy which is sent to induction coil (inductor) to produce a very strong magnetic field and finally excite visible light.
The ballast is connected to mains electricity, andgenerally designed to operate on voltages between 100 and 277 VAC at a frequency of 50 or 60 Hz. Many ballasts are available in low voltage models so can also be connected to DC voltage sources like batteries for emergency lighting purposes of for use with renewable energy (solar & wind) powered systems.