coldest temp at night?

50s is probably as low I would ever go. Purple will come out with the low temps. yields will suffer, the plant will grow slower.
 
ok so it should be fine if its above 60F?

yes, my rooms thermostat allows for a 7 degree temp drop once the lights turn off, which is beneficial. 70-77. 60's should alright, not prefect. But a colder issue is cheaper than a heat issue. Just buy a $30 electric heater with thermostat from walmart or costco.
 
its fine at 32 as long as it gets warm in the day.at the end of the season where i live it drops into the thirtys and fortys at night then back to 60-80 in the day and its fine.I had a plant turn Dark purple almost like plummish black or something last year.Hardly got anything off it tho cuz i messed with it to much and didnt know what i was doing,i dont think it was the cold that made me get a shitty yeild just turned my shit a cool color.
 
k thanks for the help guys. my disicion based on the opinions is to not move them into that cold of a envirnment unless i have a space heater.
 
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