Any lights can blind when going over bumps, it's just HIDs are so bright that they blind more-so.
I got rid of my HIDs after Wanye and DH pointed out they weren't legal (admittedly being scared to face even more points and fines) and fitted Osram nightbreakers, good buy.

I looked into self adjusters and washers, but Hella Twin's having projectors don't mean sh!t, they were designed for halogens, not HIDs, there is a big difference in projector units.
Chuff share that you greedy thingy!

EDIT: People that say up to 6K and all that, where does any legal site say that? 4.3K is OEM but the law doesn't say, I suppose it's up to MOT testers and traffic cops.