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Thanks, helps out alot. But since I'm not using a ph tester I'll need to know what can make the most change to a soil's ph. And height isn't a problem for me as the area I'm using is about 9 or 10 ft tall. One more question: Is pruning better to do early on or later to provide a larger harvest...

Lately I've been reading up as much as I can on how to grow plants but I still have some questions: 1. How many 23 watt cfl's I'll need for a 2'x1.7' room with 3 or 4 plants in it or if that is even enough room for that many. 2. Is ph reading is absolutely necessary? I can't afford anything...