yes. 12 hours on 12 hours off.. the time of day does not matter, but you dont want to disturb the plants in the dark period, so the light time when you will be needing to get to them
yeah dude 12 hour cycle figure out what will work best for the conditions you want them on when your home so you can hang out with them but maybe want to think about heat and maybe night will be cooler do some planning so that the light is going to be fit for the most comfort and I'm sure you have a timer if not I would get one immediately they are awesome
Many growers like to do the 12-hour on cycle at night, especially during the summer, to keep growroom temps down.
I usually run mine from 9:00 p.m. to 9 a.m.