They need about 12 to 14 hours of darkness. Just make sure that they get no light after sundown until they set buds. Sunlight is no problem, as they days are getting shorter and there's less daylight hours. When it gets too cold outdoors or if frost threaten, I bring mine into the living room, which is usually not used at night. Be careful moving them after the buds set. Mark the side facing the sun and be sure that the direction it's facing in its new location. Otherwise they will turn toward the light source/sunlight and if it's in the opposite direction, the buds will fall off.
