Um, no.
Not to put too fine a point on, it but exceeding 12 hours of light is not the problem.

Photoperiod is controlled by hours of dark, period.
Best to think of it that way.

Again, look it up in the archives here.
(First link in my signature)

Arm yourself with knowledge.
Grow quality medicine that is saving lives.

If you should happen to enjoy the meds?
Goodonya!
Aloha,
Weezard
Weezard Reviewed by Weezard on . can you alter the dark and light hours? I have a perpetual grow going but my veg room has out paced my one to three plants into flower a week pace. I also just want to finish out this strain. So I am going to flip my veg room to flower to so both rooms are on same time on and off so I dont have to mess with light leaks from one room to the other either. My flower room is light tight but my veg isnt. Now onto my question. Can I alter what hours are the dark hours in my flower room? I.E. I'm on a 9am to 9 pm lights on cycle but Rating: 5