Universal 446-L-SLH-TC-P magnetic ballast. This ballast powers 2 F34T12, F40T12, F34T12/U, F40T12/U, or F40T10 lamps at an input voltage of 120 volts. This ballast is no longer manufactured by Univesal Lighting Technologies, thus quantities are dwindling. When available, Lighting Solutions will ship the old magnetic version. If the magnetic version is not available Lighting Solutions will ship an electronic ballast from Howard Lighting. This unit wires exactly the same as the magnetic version and will fit in the lighting fixture the same. The advantages to this electronic version are. Lighter Weight Produces Less Heat Five Year Manufacturer's Warranty Operates more Quietly than the Magnetic Ballast.