This topic comes up fairly often.
I posted this for another query:
There are a lot of opinions on supplementing light to keep the chickens laying during time period where there is less than 12-14 hours of available daylight.
My coop gets 16 hours of light 351 days per year.
I turn lights off for 14 days to have birds go into a controlled moult late September .
Having had to install electricity for the thermostatically controlled water heater, I took advantage and installed a lighting system.
My system has two timers. The first is set to turn the lights on at 5am, off at 9pm.
Power goes on, passes through a photocell, then to a 300 lumen LED bulb, 4.8 watts, in the coop, and 2 4.8 watt LEDs for the outside run.
I light the run because I found the birds huddled outside the coop door in the dark one 5:30am morning...
They have access to the run 24/7, as it is as secure as the coop.
The lights are on only when it is dark enough outside to be necessary.
The time on very closely mimics my Summer Solstice.
The second timer is set to go on at 8:30pm, off at 9:30pm, a diffused 200 lumen LED 4 watt bulb.
This low light allows the birds to settle in before all lights out.
This system costs less than $10 per year to operate.