I a run small cab, a 150hps would do nicely in there. My current grow has 2 of 'em and I just cut a nice 12in cola for drying, just one of 5 that were over 6" on that plant. And I get to do that every 10 days :)
All from a couple of 150s...
Odor control is always an issue. I run a flexible duct...