Ducati STREETFIGHTER Owner's Manual page 239

To align the headlight beam, turn the screws (1) and
(2) located at the front of the vehicle, on both sides.
Screw (1), positioned on the left side, acts on the left
high and low beams:
- turn clockwise to lower the light beam;
- turn counter clockwise to raise the light beam.
Screw (2), positioned on the right side, acts on the
right high and low beams:
- turn clockwise to lower the light beam;
- turn counter clockwise to raise the light beam.
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1
Fig 197