A breeder told me that it is easier on the birds if you add the light to the beginning of the day, and then have the light go out naturally at night rather than suddenly shutting off the light at night.
Put the timer on a half a hour before dark and add the time to the timer so you get 15 total hours of light to their eye balls. In no time the eggs will pop out. In a few years your chicks will hatch in Dec and Jan they will be mature for the fall shows or fairs and that will be a pattern. In bantams if you do this they will be larger. I don't hatch bantams till March and April to keep the size down. So that's the tip of the day.