Durst are not dim enlargers. At least my M600 isn't.
On my old Durst M600 I had to drop down from 150w to a 75w bulb, because the 150w bulb was giving me too short an exposure time. I think it was less than 5 sec with the 150w bulb. And at one time I was considering going down to something less than 75w to give me more time to dodge and burn, but I could not find a 25w enlarger blub.
This was printing 35mm film to about 8x10 or 11x14 with a 50mm lens.
If I printed smaller than 8x10, I used a 75mm lens, to keep the head further from the paper than with a 50mm lens.