The alignment of the bulb within the Basic Optics Light Source OS-8470 can be adjusted by the following:
Four screws hold the hatch in place,
once the hatch is removed, the two screws holding the bulb socket can be tightened approximately two and half full turns to center the filament in the opening. Then replace the hatch and re-install the four screws.
A properly adjusted bulb should provide strong parallel beams that are shown in the image below.