Hi there!

I have a Durst M605 B&W enlarger with an OSRAM bulb (150W).
During work the enlarger itself is getting hot very quickly.
My lens is a Rodenstock up to f16 and most of the prints I can only make on f11 or f16 for a very short time.

Maybe the light source is too much?
What kind of bulb would be the best?