Rogers20

I have an overhead projector that uses a 82 volt 360 watt ac optic bulb The projector has a reduction circuit 120 volt to 82 volt ac (( fried!) a voltage regulator Diode and a suppressor diode)) Someone tried to fix it and left the wiring connected wrong also. It there a basic circuit that I can make to drop the voltage from 120 volt to 80 volt so I don't burn out the lamp? I need to use this Projector so you're help is much appreciated. Thank you, Roger