The LightEnerG™ Premium Ballast is a magnetic ballast that’s capable of switching between 120v and 240v. Use either the 120v or a 240v power cord (available separately) to change the voltage of the ballast. No additional wiring is necessary. The LightEnerG™ Premium Ballast can also be used with 600w Metal Halide conversion lamps. The aluminum housing is specially designed to dissipate heat and keep components cool, and a top of the line Aerovox capacitor is also included. The lamp cord receptacle accepts all LightEnerG™ lamp cords and reflectors.