My WW seedlings were 2 1/2 weeks old when they went under my 400w HPS (dont have an MH yet) and they are doing fine. I do grow hydro though and at the time they went under the main light they had roots sticking out of their 4in RW cubes. Hope that helps a lil
tinytoon Reviewed by tinytoon on . When should I switch my lights? This is my 3rd grow(2nd Indoor) and I was wondering when I could put the babies under my 400w MH? Since they have sprouted they have been under a Dual 4ft flouro shop light and are doing well.Hope to hear back soon:jointsmile: Rating: 5