No, haven't started to lay. Yes, I knew they wouldn't start until winter when I got them. We were on a two-week family vacation in late June/early July so I had to wait til July 9 to get them. Couldn't leave my babies in someone else's care. Couldn't wait til next spring, either. This had to be the year. I've waited too long!
I see.
People say they need 14 hours of light for best laying. So you only need enough supplemental light plus daylight to give them 14 hours of light. As mentioned, maybe 4 hours of supplemental light. It depends on how far north you are.
The average for a pullet to start laying eggs is about 22 to 24 weeks. You will know they are getting ready to lay eggs when their combs get bright red.