It's kind of hard to know whether something's going to cover a space you've never seen before. 8) My guess is that some mltiple of
par cans will work, though.
In any case, you can dim an incadescant just like you can a halogen. Just because it has an Edison plug doesn't mean that it has to be plugged into a normal wall socket. Edison to stagepin converters are readily available, or can be made pretty easily. Fundamentally, it doesn't work any different than a
dimmer switch on a light in your
house.