see this is what i don't understand about using one florescent bulb and doing one plant. you will be using a 2x2 area probably in your closet or whatever. you will be doing a three month cycle most likely and you will harvest probably less than an oz! now why in the hell would you want to grow less than you can smoke in three months!!!!!!!!! what are you going to do for the 8 weeks your out!? in my opinion you should grow enough to at least last you through your next cycle! if you did a 250w in a 3x3 area with four small plants you could harvest anywhere from 4 to 6 oz!! then you would be set till next harvest and you mite be able to even pay for your pg&e bill with some of it!!