Temperature question

if my temps are like 80-84ish and im using a 150w HPS sunsystem light.Plus a light fixure with 8 CFL to it.

Im plannin on gettin a 400w light.... u think my temps will go way up??thanx for any advice

I highly reccomend an air cooled hood, inline fan and carbon filter(if u need odor control).

Your current light is too high even for a 400w HPS, and with out an aircooled hood you won't be able to get it at the proper height.

Is your current hood able to retro fit to add ducting. is the ballest remote?

hmm more then doubling your wattage and you want to know if your temps will go up.....yes, alot more then 80-84ish
BUT you could prb work something like this http://www.marinedepot.com/Lumatek_250W_120_240V_Dimmable_Multi_Wattage_Ballast_Kit_250_Watt_Metal_Halide_Ballasts-Lumatek-LK1221-FILTACBAMHTF-vi.html
Dimmable 250w, so veg at 150 or 175 and flower at 250- 12/12 will help with the temps but deff invest in an inline fan in any situation