How Many Hours of Light Should I Give Indoor Tomato Plants?

Hello.

I want to try growing tomatoes in one of my tents along with my cannabis plants. Should the lighting for the tomatoes be 18/6 or 12/12? They're currently about 8 inches tall in solo cup-like cups. They won't be going outside. I already have lots of tomatoes outside. This is an experiment to see if I can grow tasty tomatoes inside during the winter.
 
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