The Iota I-232 Emergency Ballast allows you to run the same fixture as both normal and emergency lighting. This particular battery back-up transformer can allow you to illuminate two fluorescent lamps in parallel, making sure you get emergency light output from at least one lamp even if the other is inoperable. Most 2-4ft single, bipin T8 and T12, long compact, HO or VHO fluorescent lamps are all operable with this product. The charger, battery and inverter circuit all housed in a single can it is easy to install in the wireway or on top of the fixture. It also includes a test switch and charge indicator kit and operates with magnetic or electronic light ballasts.