One of my Omega LED diffusion enlarger heads (Model 2 or Model 3) may work if you simply set it on top of the upper bellows of your Beseler enlarger. You would need to cut a piece of cardboard to keep light from leaking around the rectangular lamp housing as it sits on the circular opening. I can supply a lamp without the Omega-specific vertical arms if desired. You can send it back if it doesn't work.
www.modernenlargerlamps.com
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