lightiing for a 48x24x60 grow room

hey guys, just bought a grow tent from ebay and its 48"x24"x60"

so my question is my light is my next purchase do you think 400 hps is to much or just right? should i bumb it down to 250? im using CFL's now and i dont want to use them for flowering.

thanks
happy growing!

ant thoughts?

hey RTFK, I was browsing at sears online they sell grow tent 48" 24" 60 for 89.99 USD, I havent slight what actual size looks like...believe me i have googled it but i have no lucky...if you dont mind to post the picture so I can get general idea of the actual size ? Because i was thinking to get 400w HID kits with mh/hps but Im not sure beacuse it will be hot in the grow tent maybe 250w will do ? but i just need to know what exact size of grow tent. The grow tent come with holes for vent that attach to the HID for cooltube to vent hot throught other vent to dump heat out instead into the grow tent something like that...I hope someone will answer this one soon.