A photoperiod of 12 hours of light followed by 12 hours of darkness, used to trigger and maintain flowering in photoperiod-sensitive cannabis plants, and also used to sex regular-seed plants.
The mother greenhouse uses a 12/12 schedule (lights on 6 pm–midnight) to sex out the new Schwale genetics. A black tarp prevents outside light from entering and interrupting the dark period.
Discussed in: Ep 005