Running 220V won't solve anything unless your light is made to handle it. Motors, for example, would need to be changed to 220V by re-wiring the terminations to the 220V set up. Household 220V is really only 2 independent 110V circuits so the appliance can run at lower current draw (amps). If you aren't sensing any heat in the wires, which is a sign of high current draw, I would check the dimmer; maybe that is faulty. Can you wire it without the dimmer? If the wiring feels warm, make sure all your connections are tight with plenty of contact area between the connection.