Growtent Temperature

You always want your lamps on during the night and off during the warmest part of the day.You really want at least a 10c diff between day and night temps.It wont stop growing but it will slow right down at 15c whatever age the plant is..Get the pots off the floor.I few layers of cardboard is better than nothing,a stool would be better.I will often put a HID lamp on with a metal bulb during veg for heat and spectrum.Most LEDs arent the best for veg.Youve got to do something otherwise your yield will be really poor.

If you have lights on at night and off during the day the temp won't go as low.. If that's possible that is

Anything less than 15 and the roots will go asleep.