Quote Originally Posted by Dutch Pimp
There is no ..."better"...IMO. 18 hours is the standard minimun for vegging growth.

Choosing a light cycle that fits your grow room/cabinet/closet is the key.
The climate of your area is a factor. Hot climate?.. in the summertime?...18/6 is a nice break from the heat ..(the plants grow 'better')
Cold climate in the wintertime?...24/0 helps keep temps warm/stable 78-82 degrees....(plants grow 'better')

Anybody, understand what I am saying?...or am I just whistling dixie?
Dutch Pimp,

I understand exactly what you are saying....it really is a matter of what works best for the situation. No one time schedule is better. And climate concerns can drive that decision.

In a new grow set-up with a friend, we are dealing with a basement in a building with no heat. (temps as low as 40F) Running the mom and clone room at 24/0 was the only way to go to maintain temps in that room.

In my own basement set-up I use 18/6 for my moms, unless I need to speed them up to keep to schedules, then it's 24/0. The big advantage to 18/6 in my set-up is that during the 6 hours the lights are off in the mother room, those plants are taking in oxygen and giving off CO2. The air inlet to my bloom room is from the mom's room, so I get 6 hours of elevated CO2 levels. (for the other 6 hours they get a "fuzz-puck")
oldmac Reviewed by oldmac on . which is better? 24/0 or 18/6 lights which is better? 24/0 or 18/6? I've heard root growth is better on 18/6, but 24/0 seems to make more since. I was wondering if anyone had experience/knowlege on this subject? Rating: 5