400 watt or 1000 watt??

OOk my area i have is2.5ft wide and 4.6ft long AND 5 ft tall lol and i have a 1000 watt hps that i used for other grows in a difent spot.I also have a 400 watt that i got off craigs list crazy cheap.. but the problem is i dont have a bulb for th 1000 watt right now so im going to start with the 400 watt lol SO HERES MY QUESTION SHOULD I JUST STAY WITH THE 400 WATT OR JUST BREAK THE 1000 WATT FREE IN THE SMALL OF SPACE


Thanks for looking

stick with the 400

cool man thanks

anyone else have any opinions

400watt better for energy and will do the trick for the amount of space in ur grow op