Yep, like Mr. Sunshine said.. It isn't going to be mature enough to start producing flowers until it is ready. If you go 12/12 from seed you will end up with a 3 week wait anyway. You just lose out on the growing time with the additional hours of light. I would logically say that 12/12 from seed will result in lower yields, even so, I have seen some pretty big plants that were grown 12/12 from seed.