hi newgroweroldsmoker,what ventilation have you got set up??you'll need plenty if your gonna seal your room up,don't want to fry the girl's as the 400w hps give's off a fair bit of heat.have a test run with it shut up for a few hours an then check the temp,so you know if it's ok to be shut up for the week.garden knowm's water bag idea is bang on,a week to the girls with no water is a long time.....hope this helps...have a great week ...love an respect...spliffbuilder.