@David61 Mid to late summer hatched chicks generally will start laying eggs sporadically even without light. More with light. Once their egg laying equipment matures it hard not for it to make an egg now and again during short days. Timing a hatch or 2 for mid summer ensures a constant supply...
Run lights may encourage them to stay outside longer exposing them to nocturnal predators. Lighting inside the coop brings them inside quicker.
Quality of light is as important as duration of light. The light needs to mimic natural daylight to stimulate egg laying. I use grow lights for...
