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https://www.amazon.com/Spider-Farmer-Dimmable-MeanWell-Spectrum/dp/B07TS82HWB shows 28"x28" footprint for 1 light. @18" it's a 500 umol/s blanket coverge, which is great for a mature vege'ing plant. 2 in a 3x3 might be too much. ~500 would be the minimum you want for bloom, for reference. 12" with 2 in a 3x3 could work -- as long as you don't see fewer trichomes at top as it deveolops... should occur top-down. if not, it's a sign they are evaporating due to heat or too many photons of energy. if you ever see buds below more rip than above, it's very likely your lights are too close regardless of other specs. you're tent size isn't optimal for your footprint in vege, but it can work. you'll just have a hot spot in middle at 24-30" for vege. In bloom it'll be better due to a roughly ~1" strong footprint, but with overlap, you'll have a solid coverage in your tent at 12-16". it'll be weak at front and back, though (or any 2 sides.) line your equipment on one wall, and that takes care of it, lol. offcenter lights where plants are. a rectangle shape is better for you. a 4x2 would kick ass with those lights in bloom, i bet. custom 48x30? get a cheap lux meter for $10. it'll allow you to even out the coverage. if specs are accurate, the lux can even it out just as well as a PPFD meter. anyway, along with their par readings and 28x28 coverage, you can pick a height, then lux meter can help you even it out with spacing/positioning of lights.

My guess is the way you have your plants placed and your lights turned she's just not getting the same amount of light as the others. Why I prefer straight lines for my pots so I can then set my lights according to a lux meter reading around my plants! Other than that she's growing fine. Perhaps rotate your plants around in the tent to help even out light coverage! Happy growing!

Yes untill you see 20 to 30 % runoff. Needs lots of water with those planters to soak the entire root systm. But let dry good before doing again

There are a few things that can couse this. I had a couple of plants under 24 hours of light and they always had problems with the leaves when they got into flower. 70% humidity is a little high for flower and maybe that's why one of your plants don't drink. Btw your plant doesn't look stressed or ill to me.

Are you watering to runoff and soaking the entire pot? If not the roots might not have grown very big. I'm putting in about 2.25 - 2.5 gallons of water per plant every 3 days in my 5 gallon pots.. Roots won't grow where the substrate is dry.. 👊

she looks fairly small.. size is directly related to output.. If that's how big she got that's how big she got.. If there are no new calyxes.. That is all she wrote.. How do the trichomes look are they developed and mature?

I'd say another week if you want more amber for heavy high. But watch each day closely, maturity can happen fast. You want at least 50/50 amber cloudy, but it's your preference