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if i may suggest something, that tin foil you have in there is not going to help ya. It will produce hot spots and potentially kill your plants. IMHO, i would remove it and keep the white that you have on those walls which are plastic. If you wanted something more reflective get yourself some mylar.
The tester you have is a piece of crap, doesnt read the ph correctly, get yourself a digital pH tester or borrow one from someone and look at the different reads. The best thing to do is to test and see which is best for you. I found that the digital testers are best and those needle ones are junk.
Your gonna need to get a fan in there, the reason you have those stakes is cause the main stem is not strong enough to hold them up on thier own. The fan will stimulate the main stem and it will get strong enough to hold it up on its own.
Im not sure how old they are, but if they are fairly young you could have the start of stretch working there, you might want to increase the amount of light that they are receiving.
Other than that i havent seen anything else that i would change but as i look around and find things i will let ya know..
Hope that helps
Mylar can't be found in the area and every site that I went o was expensive as hell so I haven't bought any as of yet.
I am ready have a fan in there. The reason for the stretch was because of the first grow box I had them in. The light was to far away from the plants and they grew tall. The problem has been corrected about 1 week ago. and now most of the stakes have been removed. the stems are strengthening.
the compacts are 1600 lumens each. total of 16,000 lumens from my hood alone.
the 4 17 watt tubes i am not sure of and same for the ultra thin high outputs t4s
estimation is is around 20,000 lumens.
This is in a 4 square foot area 3.63 to be closer.
I have around 4,670 lumens per square foot and all around the correct spectrum.
This should be good for veg and bloom.
For the tester so far for me it shows promise and has been used in the nursery that I was employed at. Never had issues there just need to calibrate correctly.