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hello, i have 2 ph pen testers and i have calibrated them both in the 7.0 and then the 4.0 solution, but when i go to test them both i get a different reading of .3. One will say 5.8 5.9 and other will say 6.1 in my solution, im curious on what im doing wrong and/or the .3,.2 difference will...

Hello all this is my first post here and am pretty new to growing. I have a small cab closet grow and was looking into something to allow the plants to get bigger. The grow space is going to be either 4feet x4 x8 or 4x5x8. Should I go with a 600w or 1000w hps/mh system, what wattage of light...