Okay, I now have three QT50's and one sort of working headlight. I can't afford to buy three $70 headlights from OEM. A guy posted that I could do a halogen conversion, but he never said how. I went to O'Reilly's auto parts today and found several 12volt halogen bulbs with three prong connectors that looked like they would fit into the headlight base perfectly. Does anyone know of a model # and a method of doing this correctly? I think it would be very valuable to every QT50 owner to know this information. Perhaps tomorrow I'll go down there and experiment with one of the bulbs.