Christian, I don't know if you speak for all halogen users or just your retrospect but the USDM style projectors are Useless without hid simply a candle provides more light lol..so I do not recommend non hid in projectors.
if they're concerned with the law, hide the ballast and install 4-5k bulbs,if warmup is fast and flicker free then they won't know the difference
hope this helps , if not I apologize for it
why does the law have to fine people for having brighter lights,id think itd be better as you can actually see lol.. but theres reasons that are acceptable but then theres also the opposite..
frikking laws..
i have to say i do feel for you AU guys with strict mod laws... recently they introduced FMIC Cert requirements if fitted now,so seems were merly behind the ball but getting there,grrr