Dont do 12/12 from seed on an auto, 12/12 light cycle is only needed on photo-period strains and it is used to trigger then to go into flowering mode. Auto flowers dont need a change in light cycle to prompt flowering and therefore you can leave the lights on for longer, most people use 18/6 or 20/4 but 24/0 has been used too, although I dont think it improves yield much over 20/4 cycle.
Nordic division is right, 6500k is for veg (in an auto it is the first 3-4 weeks of growth, untill it shows signs of sex), Then you want to swap for 2700k for flowering period.