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I personally don't think it was humidity related. I think it was light stress - 915 w over such young plants is overkill especially if light is close to them.
Yes i`ll go with this, thinking on Ive seen this happen in my own grow-room when i move plants from vegging room to flowering under 2 x 600hps, i always have my lights at least 3 ft for smaller plants till they settle in and higher if needs be, then i just lower them a little daily. :) Basically heat or light or a bit both stress Bulls, you`ve nailed it man
"But your still looking at me that same damn way............ Like i just shit in your scrambled eggs" > Negan, Walking Dead
Humidity is very unlikely to cause the issue you have, generally humidity is only really an issue if its constantly above 60% in veg, as leaves will feed from the moisture in the air, rather than the roots, and this usually shows up as a calcium issue. In flower high humidity again can be an issue due to mold.
I agree with the guys above, the plants are in a bit of shock as they have had a total change of environment, I would definitly try and lessen the amount of light your using, as generally vegging plants need no more than 400w. You may find investing in a heater, and maybe a fan colntroller like the ecotechnics would make it easier to keep the temps up a bit.
Also consider running the lights on during the night when the temps are lowest, and having your lights off period during the day when the ambient temps are higher :)
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