Im contimplating buying a two 600 watt hps light system and I read that your supposed to use a less powerful light for vegging and a more powerfull light for flowering? also while ive got your attention I might as well ask about Carbon filters, when I start my grow am I gonna need one of these and where do I get one?
Two 600w lights does not equal a 1200w light... that said, there is no problem with vegging and flowering under the same output. Your plants'll be fine. The more light the better. You can get carbon filters at any grow store worth its weight, online or locally.