I tried a spring grow and timed it with the suns natural cycle. I was growing in a bedroom with pretty good natural light and supplimented the room with some LED's and flourescents, anyway, I did the 24/7 for two months then the first week of March I set the lights to only about 8 hours from 8 a/m to 4 p/m and let mother natures cycle take over eventually moving them outside for the final 5 weeks.