my plants are set up for veg right now...7 in all together. there good to go for at least another 3 weeks before i have to flower. i have a 650 watt HPS lamp with a non cooled hood. ive never used a light like this. i have the ballast and have tested the system and all is in working order. my questions are as follows: is this enough light for 7 plants maybe more? if the room is vented properly and i have reflective walls (mylar etc...) is this a sufficient light source or should i downsize or maybe upsize my plants number? how much space are we talking here when i do consruct a bigger grow box for flowering? any advice would be great....