I start ramping up my light after the girls have had a fall break, most of them have molted, and my egg count goes down to the point when my customers start following me around trying to shove money in my pocket for eggs I can't give them. I add an hour/week with light provided at both ends of the day, until my final schedule looks like this: Light on @ 6:30 AM, off at 10 AM. On at 3:30 PM, off at 8:30 PM. I use a warm spectrum LED, on a single timer, and set a landscaping light close to the LED bulb so it can act as a night light. (Though this is totally not necessary. The birds are always on the roost before the big light goes out, and to my knowledge have never been caught in the dark off the roost. They are very quick learners and learn the light pattern.)
I choose to do a split schedule, b/c otherwise, that light would go on at 2:30 AM, the roo would start crowing, the birds would be stuck in the coop for hours, waiting for breakfast, and the pop door to open. Their first eggs would surely be frozen by the time I got out to tend the birds.