[polyglot]

I was under the impression that switching power supplies were not good for enlargers. But they are ok, if designed for other halogen lights?

Enlargers heads are basically just light bulbs so switching supplies are quite capable of running them. Light bulbs are mostly resistive, which makes them a well-behaved load.

The only possible issue you might have is that if you use a digital enlarger timer with triac output, that's somewhat incompatible for some switching supplies - it might not switch on reliably. Make sure your enlarger timer has a mechanical output relay.