Ditto on the 12/12 info. As for your lighting - the specific lights for vegging/flowering are only guidelines - many growers use ONLY MH or ONLY HPS throughout the entire grow, it's just that MJ has been proven to undergo a bit less stress when given the specific types of light during the respective cycles. I like to mix it up during both cycles, and you will notice that some newer lights coming out these days offer a bit from both spectrums, both in MH and HPS. Good luck!