Found few old desktop computers power supply laying around the dumpster area at work place awhile back. Brought it home and tested to see if it still have some life. 2 of them were dead, but the other 2 were still alive. I took the switches and fan from the dead ones since this would be usefull for building
boosted ballast
in the futrure. One of the good ones was a heavy duty power supply which is rated at 400W with dual rails, 12V @15 amp and 12V @ 14 amp. This would be perfect for quad aiming process. My old is is single rail and it was blowing up fuse when I tried to power up 2 ballasts at the same time, but with this dual rail, it would be do it.

Dual rails

Cleaned them up, cut/tie wrap all wires and connection that I don't need. There were a bunch of +12V yellow wires, so I just took a few and soldered it together to make one wire. Same thing with the ground (black). I added another 12+ conenction to hook up the selenoid also. I put a on/off switch and fuse on one +12V for one ballast so I can toggle it on/off during projectors aiming process.
9006 power inputs to both ballasts and selenoid.

10amp fuse and toggle switch just in case the ballast draws too much.

Jumper is needed to bypass the computer on/off

I'm only showing this jus to show the possibilities of powering your HID system outside your car with very little money.This setup works for me but may not work with your own application. Use this at your own risk. Make sure you wear proper eye protection when soldering and working with metal. Make sure you dump all the energy off the Capacitor when you strat digging/opening the case. Sometimes the caps still have some energy left, that if not grounded properly can cause short or shock.