Ok 1st, is this a result from accident, as I know 1st hand that these facelift bixenon headlights are supplied from factory on new cars with cracks on them, trust me I've been to hell & back with audi over these cracks on new headlights, checked 10 sets ordered in & all had the same cracks on the drl area's about 1cm long, also bottom edge a minor crack.
We checked showroom cars as well, all had the same cracks.