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Forget HD's and HPS in that case, it'll get much too hot.
You'll have to go all CFL's. I started off in a similiar space with excellent vent but with a 250 HPS and it's still been a struggle. I LST'd like mad but when flowering time came along, I realized I was still in height trouble.
So now I've built a new room , 2*2 sqm, and am just testing it for heat issues right now.

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faithlessxxx Reviewed by faithlessxxx on . Complete Growing Novice. Okay, so I've never grown before in my life and would like to try. I've read a few guides and have a couple questions to shoot out before its go time. 1). The area I plan to grow in is a tad small. 2 ft deep, 2ft wide and 2"5 high. Is it doable? 2). Its above a water heater. It doesn't get moldy or anything like that, but it does get warm. Is that a pro or a con? 3) If the first 2 questions get the green light, what are some strains that would grow nicely in said area. Something Rating: 5