Get the longest life from your lamps and bulbs with high-performance replacement ballasts from Batteries Plus Bulbs. Choose a new electronic or magnetic ballast to raise the efficiency of your fixture, reduce energy loss and save money. Effective lighting ballasts are necessary to operate discharge lights and regulate the amount of current that passes through a lighting fixture. Lighting ballasts must be used to control current flow and prevent light failure. We have a huge supply of watt and voltage options available.