here's the full setup in more detail ( they don't have the Cooltube either but I guess I was thinking heat would be less with the 400w, and the tent will be in an air conditioned room so hopefully it'll be cool)
Agromax 3.25' x 3.25' x 6.58' tent
Euro 6" Inline Reflector
Digital Greenhouse 400w ballast
GrowBright 400w HPS bulb (55,000 lumens)
GrowBright 400w MH Conversion Bulb (38,000 lumens)
GrowBright 6" HV Fan & Filter Combo With Clamps & Duct Work
Fox Farm Ocean Forest with the nutrient trio (i'll probably mix this with some

light warrior from a local place as that seems to be popular)
it comes out to needing around 52,000 lumens for 5000/sq ft so that's pretty good with the hps bulb but the MH one is kinda low, but what do you think?
i'm gonna ask when they plan on restocking 600w but I'd probably not be able to wait if it's more than few weeks or so lol