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If 86 is the temperature of the top of the plants, yeah it's a little bit hot. 80-84 would be okey If you don't have money to upgrade your grow, just get a computer fan and hang it in the reflector facing the light, it should lower the temps a little bit.
If im not mistaken you should lightproof your box, and you should get a fan so your plants dont fry. Plus they need air flow not only to cool but to supply it with more CO2
Ya i got a 4x4x7 comin friday.. im goin get the exhuast fan on them and the duct work to get ihe heat out of the tent...
i do have a fan blowin on them now and they really loved the transplant to ocean forest so hopefully theyll be alright till friday there only gettin the 400w durin the day anyhow
Ya my grow room is in the basement and we dont heat our basement so I let the light heat the room and it gets to about 77ยบ, but in the night period it drops to like the low 60s. I dunno, my 2 cents