The Valuline 1000W Harvest Sun Ballast will run both High pressure sodium & metal halide bulbs. The heavy duty carrying handle makes it easy to transport or hang on the wall. All Harvest Sun Ballasts can be run at 120 or 240 volts, and no rewiring is necessary. The 1000W Harvest Sun Ballast features an AlumaLite ballast core and an extruded aluminum case. They are made with the highest quality components, including a high temperature American made capacitor built for long life, and a separate capacitor compartment made for cooler temperatures. Also, a vibration dampening system is included for noise reduction making them extremely quiet.