Well i think most of us have to change the light cycle to 12/12 to sex em.
I don,t know where you got your growing info but it,s all a bit mixed up, if you want to grow a nice plant then if i were you i,de get myself a basic grow guide for about £7 or so. It will save you £100s on your first harvest.
You will have an all you need to know step by step guide that you can pick up and flick throuh it when ever you want without having to ask on the boards all the time and wait for an answer.

Disco.........