I’m about 30-45 from Center city Philly. Perfect blunt ride though 
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@vicbesos420 Yes I bought a PH / moisture meter with the probes. I also seen what looked PH test strips, would those of been better? Another question, I’m sure it’s some where in the forum but thought would just go ahead and ask here. How do I safely adjust the PH if I find out it is off? I want a PH of 7 right? Mary has been in flowering almost 3 weeks now and haven’t noticed any difference in the last week. Street light and a neighbor’s security light was killing me at the VERY beginning of flowering so I hid Mary behind a very tall brush and hung up an old black trampoline tarp on the bush to block those lights from directly shining at night on her but I’m wondering if the indirect “glow” is enough to be screwing her up. Got my fingers crossed and hoping for the best I guess 
Recommended pH for soil is 6.5
Recommended pH for hydro is 5.8
I would strongly suggest reading the Grow Bible. It explains everything you just asked. And trust me, learning all you can about pH is very important when growing marijuana. Hope this helps!
Picture is courtesy of @MacGyverStoner
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Recommended pH for soil is actually 6.5
6.8 is more the highest pH recommended, in general only up or down about 0.3 pH from ideal target pH, if at all possible.
So – soil is max 6.8 and min 6.2, in general, soil can range a little more than hydro without problems.
The broader somewhat safe range for soil is about pH 6.0 to 7.0
And since hydro’s target is 5.8, the max would be about 6.1 and the min would be about 5.5
And the broader somewhat safe range for hydro is about 5.4 to 6.3
Keep in mind, the roots will suffer damage at around pH 5.4 or below.
~MacG
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can also be caused by early frost.or cooler temps.produces lower thc.