Hi,
I see 2 real options for that space, one you could go with 4 florescent lights, home made to fit the space. You can buy plastic tubes that you put the 4 lights in. they are for shops or any place where the light might get busted the plastic tubes contain the glass and stuff. The reason I mention them is that you can grow weed touching, absolutely growing all around the tube no problem, so you could rap the space in lights. I would give that some serious thought.
Its real tight for a vertical grow i would say it's not an real option. I believe, The best light coverage you could get for your space is 3 or maybe even 4, 250w HPS. If it were me I would buy 3 250 watt HPS and decide if I need the 4th after I set the 3 up. Air cools hoods all strung together are the way to go in that space. but its not necessary, if you maintain a good air flow open is fine. Anyway thats my 2 cents.
Good luck.