Originally Posted by NYCDUDE
Ok so let me understand this correctly. the lights are gonna fit physically, but I can't just plug them on and twist the switch hoping they will lit up?
That's right, they won't work*. The lighting technologies are completely different. Halogen tech is simply heating up a filament until it's white-hot. HID doesn't have a filament but instead produces an arc of electricity in a tube between two electrodes. To do this it needs a ballast, which produces a blast of electricity to ignite the gas and salts in the tube, then lower, regulated voltage to maintain the arc.
*BUT... This doesn't mean converting to OE HID is impossible. Check out that thread I linked. There are active members, like moderator njjoe, who can help you through the conversion if you're interested.