Yeap. 400 watt HPS will do you and your girls real good. The light will produce heat (unless you use cool tube) as well, warming up the area. You will see side branches developing, faster and denser growth. Also check out the pot size once you install 400 watt HPS: once the girls starting to grow, you will realize transplanting is the next step..

Good luck!
walktheline Reviewed by walktheline on . Very slow growing questions Hello, I am growing a couple of plants for myself and am having some problems. The main problem is that the plants I am growing are under flourescents and are growing extremely slow. They are not starved for light because the nodes are about 1/4 inch apart but all the leaves are staying real small and like I said the growth is sloooooowww. They were slightly nute burned in the beginning because of the Miricle Grow soil I used so all of the first leaves crumbled away. Now it looks as though Rating: 5