first timer

hey everyone i just signed up for this site and i am a first time grower, i just received my fully buit unit a couple days ago and already have 3 seedlings poping up. i was just wonderin if the system i got is even good its 35"tall 30"wide and 20"deep, it has a 600watt hps light and is a passive hydroponic system is that even enough room for good yeilds and on avererage how much do you think i can get from it every harvest, here's the link to the one i purchased Limited Supply V1: Mini Stealth Grow Cabinet is a Self Contained Indoor Hydroponics Closet System for 4-16 Plants w/ a 600w HPS & Floros!!

and here's the link to the one i purchased Limited Supply V1: Mini Stealth Grow Cabinet is a Self Contained Indoor Hydroponics Closet System for 4-16 Plants w/ a 600w HPS & Floros!!

that systems sounds a little small for a 600w light. not that it wont work, but i am guessing that you'll be battleing high temps inside this cab. let us know what you think after a full grow though