The ones that I find work best are the undimmable ones, they look like the standard enlarger bulb, look frosted, and should be small enough to fit your besseler, best thing to do is look around and maybe google them for a look, I got mine from B@Q, it is their own brand dial bulbs, they are a large chain of DIY superstores over here, don't think they operate over the pond, but I would check out what must be your equivelent, and see what is around, worth it as they do the job well, last almost forever, and no more heat in the enlarger head, so no more negative popping,
Richard
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