You will not be able to reuse those bulbs in your projectors. Also, those "halo projectors" are designed for halogens and seem to have a poor beam pattern. You'll get much better results by retrofitting Bi-Xenon projectors into your stock housing. When you do get new bulbs, stick to 4,300k. A good set of projectors will have a nice color band at the cut-off anyway. Also, HIDs in fogs is pointless. That's WAY too much light up close to the car. A lot of light up CLOSE is BAD. That hinders your ability to see in the distance. Although, I think halogens are brighter than 30,000k HIDs anyway. But stay away from the blue/purple light. Trust me. If you have, at least, the Mini H1 Bi-Xenon projectors and use 4,300k bulbs, people in the distance will see your lights as blue/purple. That's called "color flicker" and it's just awesome. Ricers use blue bulbs in their halogen housings to try to replicate that. Yeah, just dumb.