From MaxZook :
The two holes in the black bodywork are access for the left/right beam adjustment (horizontal)... there are two bolts directly opposite those across the bulbs that adjust up/down (vertical). These are accessible by turning the forks and using a 10mm nutdriver between the forks and headlight housing.
This adjustment is VERY IMPORTANT if you take the next step along the path of Bandit Enbrightenment. I had a Bandit headlight mod thread around here somewhere...
It boiled down to two things:
I removed the blinders from inside my headlight nacelle through methods described somewhere on Max Suzuki - basically heated the whole shebang up in the oven to make the seal soft enough to pry apart, removed the offending part from the low beams, resealed.
I replaced the stock lamps with HIR (Halogen InfraRed) lamps from these guys - http://hirheadlights.com/
. Basically, there's a coating on the inside of the lamp that reflects the heat back onto the filament, causing it to glow brighter without drawing any more juice from those flimsy stock wires Suzuki used.
If you do this, it's very important to make the aim adjustments as stated above, since it becomes bright enough to night-blind oncoming traffic.