Minitiger
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Just going on what I've read and been told, I'm keeping mine around 78-80 lights on and then 68-70 off as it's a sativa that likes light and warmth. Been told by couple of other growers that I could easily bump it up few degrees more 80-82 and possibly get better growth rates. They're not bad, so haven't seen the need to spend more on electricity. I've also been told by several growers in the area to try and keep temp fluctuations of no more than 10 degrees. Really suffered some extreme fluctuations early on in my grow, so talked to as many growers around here as possible about their experiences.
On a side note; before I was able to control the temp on my grow (just moved it last few days) my temp changes were reversed; cooler lights on than off. Perhaps this explains the really tight internode length my plants are keeping. I am using LEDs and have been told that they usu. keep shorter lengths too.
Dude, that's been happening to me too, lately. Driving me fucking NUTS haha. Been around 68-72 during lights on and mid to high 70s during lights off. Kinda got it under control now, but last week it got much cooler at night (lights on) than I thought it would, so the temps dropped pretty low for a few nights. Really annoying.