By the way, sorry if I sounded pissy, Matt. I think St. Louis may be getting to me... or the cold.
Or I'm sure you're all too familiar with my frustration over people who talk like they know everything, but can't really tell you why their methods are correct.
Regardless, I appreciate your paying heed to my suggestions when it comes to electronics. Call me old school, but there's a way to do it, and there's a way to do it safely, or correctly. That "safe" way involves the use of relays and diodes. Note that though HID ballasts are 12V accessories, they do require a high amount of current. This is why I always tell people to get constant 12V straight from the battery, and to fuse separately. This way, too, your factory electrical system doesn't get put at risk by introducing a high-load circuit that involves HID ballasts and several LED arrays. And let's not even get me started on grounding! You should always try to ground aftermarket lighting directly to the nearest ground point, and not back to the factory harness ground.
If you need more on relays (as I'm sure folks new to electrical will), click
here