Aren't those little autoflowerers? If so, and I bet they are, you want at least 18/6 light cycle if not 24/0.
Autos do not veg you know, so they don't need the 12/12 cycle to flower. Autos can mature at 12/12 but they will be slower.
If that is all the plants you have going I would turn the lights on permanent. Just make sure to water every day in those
small pots.
Good luck, BigSteve.