I know what you're talking about. I actually asked the guys at the city fleet maintenance garage if they could do this to our Crown Vic Police Interceptors. It does really light up the road. We wanted to do this for extra lighting during traffic stops. (Yes, I'm one of those a**holes who passes out speeding tickets...especially to ricers!!:winks ) The tech told me that there are two filaments in the bulb, one for high beams and one for low. When you pull back on the stick, it lights up both filaments giving you that "instant sun" effect. He said that we would either burn out the bulb or burn out the wiring harness. It just causes either too much heat in the bulb, or too much current draw in the wires. Supposedly, this can happen when you put those HID effect bulbs on a stock harness, it can heat up to the point of failure, though I doubt if you would really burn up your car!