how many lights and what type of lights are you using? how much space do you have to work with?? hydo or soil??? if soil how big are your pots?? sativa or indica?? man theres so much more to it then just having a bunch of plants!!! you can take 10 plants and throw them under a 1000 watt hps right from seed or clone and lets just say for example you get 1 or 2 pounds from them in total.. well you can take 1 plant and veg it for longer with bigger pots with more soil and get the same amount back from that 1 plant... shit maybe even more... theres many tricks and tweaks but nobody can anwser your question..