you very much can.. i ran a 600 watt in a 2X2X8 foot room.. 160 CFM fan vented to attic, and a similar fan sucking air in from the attic. Light was in a cool tube, which barely fit at an angle in the closet. I was doing this in the winter time, starting in october and shutting down in the end of april.
No way no how could this be done in the summer, temps would be astronomical.
It sucked being limited in space, but as long as i could grow i was a happy camper.