hello guys am new in this site, plus am a very first newbee. my question is am planning on staring my first grow room i have a 12feet tall 10feet wide 10 feet long room about 1200 square feet. I have 7 hps light am planning on growing then big on 5 gallons am staring out with 60 clones my yield goal is between 15 or 20 lbs how tall do i have to grow my clones and what do i need to achieve my desire yield... my strain is purple haze or haze i really need this yield to be acomplish i invested all my money in so my first harvest will be life or death....please if any experience or pros out there can help i would greatly with all respect apreciate it..thanks

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