The Xtreme Ballasts fom Custom Automated Products are the best garden lighting ballasts available. The cases are extruded aluminum to provide cool operation. They have a vibration dampening system for noise reduction. They are very quiet. All C.A.P. Xtreme Ballasts can be run at 120 or 240 volts. No rewiring is necessary. 240 volt power cords are available. They will all run either M.H. or H.P.S. bulbs (with the exception of 600w which will run H.P.S. bulbs only.) They come with a 120 volt power cord. Xtreme ballasts carry a Lifetime rebuild or replace warranty.