the pair of mk3 headlights i used for the blackeyes mod was very dangerous in the light output stakes at first ( i got many a horn blast from cars behind me when driving very slow down country lanes ( even with the full beam on it was poor )
i adjusted the buggers myself in the end as i stuck some philips vision plus bulbs in and it made very little difference, i just parked near a wall & using the little adjustment screws on the top of the headlight under the bonnet i raised the levels ever so slightly on both sides of the car & then went for a test drive.
adjusted them in small amounts at each side like above a few times till i was happy with the light given off & then left it at that for a while to see if i get flashed at ( which upto now i have not - even followed a few guys from MEG coming back from meets etc & they have said nothing to me ) they also sailed through the MOT about a month or so ago.
but you could always get an MOT station to adjust them to the MAX of the range your allowed and then you will know for sure they are legal.
( silly thought time here so dont shout at me, is the headlight level control roller thingy set to 0 and not somat like 3 or 4 as that can make the light output crap unless you have alot of weight in the boot )