That is still debatable...but I asked this in this area labeled 24/0 or 18/6. If you scroll down...or it might be on the next page you should be able to find it. There was some really good research done on it. I decided to leave mine on for 24 until they flower.
Bree1978 Reviewed by Bree1978 on . First grow - Leaves curling, NEED HELP PLZ! I have 2 plants under 2 150w CFLs right now. One of them has all of its leaves curled upward. Kind of like it's reaching for the light. I also wondered what light time cycle they should be on. THey are only 8 days old and I have had them on 24/7. And when can I start using fertilizer? Any help would be great. -UPg Rating: 5