You getting too cold during lights out? No more then a 15F drop is the rule of thumb.
Hey Bud . . . nah, I might top out at 75, with space heater running, and at 70 with just the light.
I'm only allowing it to drop 5-10 in the dark, in an effort to try and keep the soil warmable at only 72.
Having stuck to one gallon pots until this grow, the 2 gallon are twice as hard to manipulate (LOL) with my temps, but I'm figuring it out and should double next grows results, which I expect to be the ounce a plant, plus popcorn, for D-Day harvest of 3 in a week.
Here's a sample of next weeks bud.