im going to start a new hydro grow today, iv been doing the 12/12 in the past, but i want to go for 18/6 because of rest time and electric bill ( which is fuck all , im just a tight arse) so i was wondering if the dark in 18/6 needs to be leak proof which means ill have to close the closet door ever time or can i just leave them open , thell still be in the shade with barely any light , but it wont be complete darkness, thanks,