My grow boxes are out in my shed, getting cooler out as that time of year. Is there a range where variance between high and low temp is a problem? Out in nature there is quite a range between high and low for the day, but then the sun not out 24 hours either lol. Also what is lowest you can go and still get the plants to do something? Put a heat lamp out in shed set to come on/off a few times at night, my range has been 50'sF low to 60'sF high temp. It had got cooler than that prior to that and leaves started going purple on my bigger plant. Got some bag seed I had started last month and a couple clones, just didn't want to waste more time with seeds or buying clones if that is going to cause me issues thru the winter.