hrmmm almost 40 days and no sign of sex? flowering has not induced @ all? almost looks like to me, and my past failures that either that cab is too hot, or the lights are way to close to the plants and are burning up the leaves. looks like browning, discoloration and appears the leaves are getting crispy and brittle, seems to me to be a heat problem. i too will be facing these issues with my up coming grow project. cfls and heat usually an issue for me, as long as the heat can be controlled though, cfls perform just fine. good luck and i will keep posted and following this grow through till the end.