yeah, You really don't want it getting down to low 70's... so either put them on 24hrs or add a heater or something to bump temps up a bit, you'll probably need add little humidity as well to balance your tent.
temps around this neck of the woods, like -20 below zero to -30 below zero.. so my lights will be on 24hrs for now on. this is the awesome thing about auto's, you can never ever change the light cycle like this with a photo plant...
in fact if I had a photo grow going at this time, I do not think I'd be able keep tent warm enough for 12hrs, I was having hard enough time with 4hrs off and using sealed tent...
yeah actually I never turned my extraction on, until I had preflowers.. that will keep it from cooling down to much.. I didn't realize ya had that running already, or I would suggested putting that on a repeater, so ya can run just short bursts with extraction.. I'm sure it's already on speed router, adding the repeater will allow ya to run 5min blasts or less or more, so more options then a standard timer, which your stuck at 15min intervals ..
