Before I switched to diffusion enlarging I found I had a very hard time getting decent quality replacement bulbs for my old Omega condenser enlarger (it used a 75w - I think PH140?). I found it increasingly difficult to get good names like GE etc for stuff like this, even when ordering online or talking directly to specialists and distributors. I ended up mostly with shit EIKO or whatever other crap from China and the opal coatings were always garbage, never uniform, with hot spots, concentric circles and other things showing up on the baseboard.