This is my first time growing. The plant is 3 weeks old and i have it on a 24hr with 2 23w cfls.I just added 1 fluorescent light with 6 little lights at 40w each today.. when should i start the 18 on 6 off??
Anytime you want. 24 hours of light isn't necessary, but go for it if you're not concerned about electricity usage(not that it's a massive amount). I keep my plants on 18/6 throughout the entire veg phase. How big is your grow space?