if i am not wrong there should be a hole on the metal frame on top of your headlight when you look into it with a flashlight you should see a gear with teeth u can use a flathead to turn it to adjust your headlight
he's talking about projectors though, not the OEM reflectors.
adjustability would be specific to your housing. it is a retro, or a aftermarket unit? if the latter, post the make/model of it, and maybe someone here with the same light can point u in the right direction.