I just switched from 6 23w CFLs... to a dimmable 600w Hps... My plants are about 10 days old, running at 400w, tent size 48x24x60 it is placed in my living room, I don't have ventilation system yet still looking for a nice set up if you have any recommendations please share... it was getting way to hot in my tent so I added a fan, I found an inline fan I have that attached to the top to see if that would help with temp, Ive been keeping ceiling fan on and opened up balcony sliding door ... any advice is helpful