Lights have been on 19/5, during which the temps have been in the low 80's. 'Lights off' the temps never go below 68º, so I really don't think low temps are the cause. I did mistakenly put my light at 400w when I meant to have it at 300w, and it was like that for a long time before I caught it, like most of the flowering part of the grow. It never bleached the top leaves the way too much light can do, but I don't know if that had any impact on leaves turning. After discovering it, I turned it down and raised it a bit.
During the last week and for the rest of the run I kicked the fan up a notch, moving the temps down to around 76º. Even if the colors might look pretty, the plants look stressed to me. I think over the next couple of weeks I'll be at least harvesting the tops. Since it's a dense run and since I have one Dutch Passion plant that has many weeks left to go, I'll probably do a staggered harvest and cut the main buds while the lower parts of the plants get some light and mature some more.
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