I know it is very very important that your plants stay in pitch black dark for a full 12hrs in the 12/12 cycle. Is it as important when they are vegging and you have them on like a 20/4 cycle? Does that 4 hours have to stay completely dark or does it really matter? I know when they are vegging you can keep them on 24hrs a day so do they really need that 4hrs to be completely dark? So if you choose to go with a 20/4 or 18/6 or something do those few dark hours need to be dark or can i continue to go in there? Its alot easier to work when that bright light isnt on. The reason i ask is i have took alot of pics when the lights are off cause it looks better. Also, ive worked on them or in the room alot when the lights were off. I have quit doing that recently cause im getting ready to switch to 12/12 but i was wondering if that did any damage to them? I wouldnt think so, or if it did it wouldnt be any noticable damage. Well, thanks for the replies.