Thanks for all of your replies.

With this information I am deciding to run my veg roomusing both 18/6 and 24/0.

I will veg my mothers with 18/6 most of the time. But when I fill the propagator with cuttings from the mothers I will run the lights @ 24/0 until the cuttings are rooted. Then once I see signs of all cuttings showing roots I shall revert back to 18/6.

I want strength and good root formation, so I will utilise both methods.
home.grower Reviewed by home.grower on . Photoperiod: Veg @ 18/6, 20/4 or 24/0 I'm unsure if this kind of query has been raised before. If it has forgive me for repetition and I'll be happy to follow any links to existing threads. I'm vegging under 1 600W HPS for 18 on 6 off. Does any one know the science behind 18/6 as oppose to 20/4 or 24/0? Please Share!! I've read on other sites threads that offer differing opinions. Some people swear by 24/0 while I have never tried any other regime besides 18/6 unless it was by accident where timers didn't switch off the Rating: 5