I believe that they are referring to the one hour of light as a means to cause stress to the plant, but stress only results in hermies. There is no sound reason to do this IMHO.
grey1223 Reviewed by grey1223 on . Interrupting The Night Cycle? I have a question... Is it true that when you interrupt the night cycle with a maximum of one hour of light you get more females with this? I read this from another source and was wondering if it is true. Quoted from this site, "Another idea is to interrupt the night cycle with about one hour of light. This gives you more females." Rating: 5