can you alter the dark and light hours?

[Weezard]

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