also ensure while harder, that the proper lenses are in the
lens train and that the proper
lens train is in the
barrel/snout of the
fixture.
Start with the
bench focus - constantly after ever few turns of the screw
driver open up the can and ensure the lamp is near it's center and especially won't be touching the
reflector, than go back to focusing once corrected or ok. Mostly a question in
bench focus of where that "
filament"
image is in the center of the beam for relative terms of how on center the
filament is to the center of the
reflector/
lens plane. Than if the
bench focus after that how far up or down in proximity to the
reflector is the lamp out of adjustment in being able to focus to it's natural distance to the
reflector.
After this, and only so much
play you should be able to do in it getting better or not, I would suspect wrong, not enough lenses or wrong
lens train for
barrel in yes the lights coming out correctly from the
reflector but the
lens train assembly is not optimized for that beam of light. First guess would be too small of lenses say a 6x16
lens train in a 6x9
barrel would show the
filament.
Also a question of
bench focus distance. Run the
lens train of course to get a hard
edge around the outside of the beam to start and you should be between say 14 and 20 feet from the
screen projected on. If other than this - especially less and a not hard
edge, you might also get a
filament image.