Some do use them, but for a non regular customer 
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Correct. You have another independent reading to compare and contrast
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Sorry to hear of your loss 
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Can anyone help me with my question about my grow room and the foot print of the lights? Posted it up above earlier today. Thanks.
On another note @Budbrother and @Growdoc - so epically stupid. I took my water to our local water treatment āstoreā as Iām already a customer and they tested my water for free and the pH of the water Iām giving my girls registered at 7.5. Now I didnāt see how they did this, but this is what they came back with. I got home took that same jug, calibrated my meter in the 7.0 solution and got 7.0 reading. Cleaned it off and put my meter into the same jug that the water ppl told me was 7.5 and got a reading of 5.9!!! WTF!!! HOW CAN THIS BE SO EPICALLY DIFFERENT???
Beyond frustrated. So now I will never know my pH unless I spend hundreds of $$$ on a better meter and this one already cost me $59 bucks. Just rots my socks. Ok, Iām done.
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Iāve seen a lot of people using this one:
Cheap but the end up buying a new one around every 6 monthsā¦
And, even more using this one:
Thatās the one I have and it seems really reliableā¦ 
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@kaptain3d thanks dude, looks like Iām spending $109. Good News thoughā¦ Amazon is refunding me for the one I spent $59 onā¦
Can I use this in Soil???
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Nope, in tests water onlyā¦
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Ohā¦then I canāt use this one. I need one for soil. 
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Thanks Kap, Iāll wait for @Growdoc , @Dman1969 or @Budbrother to chime in before I buy.
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I think I had the wrong linkā¦ it might be thus oneā¦
Our friends should be able to help.
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You dont realy need to test your soil as long as water going iis in right range it qil drift in the media over time with dry backs
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But if you do just use enough water to gather some runoff and test it it will give tou a close reading of tour soil
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That is exactly the one you need! Then you can ph your feeds and check runoff to prevent them getting bad out of line. The PH60 is what I have, works very well.
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They need to make these letters futher apartā
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I have a blue lab Pulse Meter itās very pricey but it is for soil only And it has a bit of a learning curve to get the calibration down pat
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The difference comes where we need more wattage to push through flower. You could put both plants in the 4x2 box and they would get sufficient lighting in flower but theyd be close together. From the graph you displayed you see the degradation of ppfd out towards the edges. In flower most like to be around 1000 ppfd. We use the phototone app (free) or par meters to check this. 400-700 in veg and at flower increase up to 1000ish back down a few weeks at the end of flower. Basically trying to mimic the intensity and pattern of the sun. So the size of the footprint of the lights is what weāre looking at. The SF1000 you have are basically 200 watts. General rule of thumb for flower is 40 watts per sq ft. 4x2=8, 8x40=320 to flower out a 4x2. 5x3=15, 15x40=600 watts to flower the 5x3. Hope that helps.
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@SausageMahoney yes HELPS TREMENDOUSLYā¦ So basically my ālittleā lights will reduce yield and quality of the buds. Right? And the other light that will be on the other plant will do just fine. Right? So, wrap is, I put 2 of the little lights on one plant and the big ānewā light on one plant and see what happensā¦
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@growdoc, ok, so the first one that Kap sent me is the one? And stupid question, how do I catch the run off? with a ācleanā drip pan and how much run off do I need to get? 2 tablespoons, 1/4 cup, 1/2 cup???
This one right???
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The new light is 330 watts. Thatāll cover 4x2 as @Storm said. If you wanted you could put them both under all 3 lights and be around 500 watts. 500/40= 12.5 and sq rt of that is around 3.5. If you could get them in a 3.5x3.5 area might be able to flower both. Im not sure if you lose anything not being a tent. @Dman1969 and @Dennis62 both have open areas. Does that impact the footprint compared to a tent?
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Well in an open room (my room is 9x18) you donāt have walls around the plants like you do in a tent. I have 2 lights hung in a row. Each light has a 5 x 5 footprint 
so my grow area is 5 foot wide by 10 foot long. The way I grow I really should only have one plant under each light. But I like variety. So I put 4 under each light. And it always winds up being about 7 foot wide and 14 feet long. The footprint of the plants that is. So Iām wasting a foot on each side and about 2 foot on each end. But I canāt complain I get some really nice buds and the smoke aināt too shabby either. 
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