Sorry, Chris. Ignore what I wrote below, that was hearsay from a colleague.
I checked again, and you have a legal requirement to not dazzle oncoming drivers, so will need to either adjust or use deflectors (or a bit of electrical tape!). Non of th edeflectors I've used so far have instrucctions for a 4200 so I just guessed for placement.
If you don't have deflectors, point your lights at a wall and stick some electrical tape or similar on until you think they won't dazzle people driving a standard car towards you.
IGNORE THIS BIT:
Don't need them for xenons as far as I remember.
Actually, not sure you
need them at all
http://www.theaa.com/motoring_advice/touring_tips/france-monaco.pdf