I've got some t12's... but wanted to get more light in the closet... I get around 20k lumens from my 4 bulbs, so it's cool... but hot. Is that an oxymoron?

I've looked around and can't figure out how to change the title... any help you can give would be greatly appreciated! Thanks for stickin around axxxxe!
NoDrugs4Me Reviewed by NoDrugs4Me on . Let's start at the finish line! Now that I have you guys' attention! I'm looking for max yield... who isn't? This picture is the best I can do to describe the room. At the moment, I have 1 girl in the corner of the flowering room under a 400w HPS vented with a 4" fan into the ceiling. I have 5 BEAUTIFUL indicas, each in their own 5 gal bubbler bucket and ONE massive clone of the aforementioned plant in flower - all under a 4 foot 4 bulb T5 @6400k vented by the same type of fan that exhausts the HPS. That seems to be Rating: 5