Oh well for you 12/12 if you can maybe think about on at 7pm off at 7am. i always tell epople to do this for two reasons.
1 your lights are off during peak charging time for electricity and on when its cheaper so you will save some money on your electricty bill.
2 Because its naturaly hotter in the day then at night and at night when you're lights are on it will maker it hotter so you have a more even tempature all day. Of course if you have central heating and air and keep you're house at the same temp all the time that doesnt matter but if you're like me and don't it works well. My grow rooms are almost 75 all day but if I ran my lights in the day time they would be at like 90+ and 60-