I just posted what I about to say here in a CFL journal. I think it is ok to go ahead and put them under the MH now. I do. Here a few pics. The larger plants are at 18 days (old school skunk) the dixie cups are at 7 days. (deisel ryder) And it is just a 400w MH, so max lumens is not an issue. If you have a larger watt lamp, just back it off a bit. Hope this helps and Happy Trails! PS and those little bastard skunks already stink to high heaven! I do not grow them that often, but what a BUZZ!