We recently moved a batch of chickens from a tractor near our house to a stall in our barn, which is farther from our house. We did this because we could make the stall much more secure as well as house more chickens. The downside is that we can't see the run from our house, and so I can't monitor the run for predators like I used to. The new run is surrounded by electric fence, but it doesn't have netting on top yet, and I'm worried about hawks. I'm skittish on letting the chickens out into the run yet until I'm comfortable that it's secure from daytime predators. So....for the last month I haven't let them out. There is a small window in the barn stall that lets in light and air. And I open up all three large barn doors during the day to help with ventilation and bring a little more light in. But, it's definitely not as bright as outside. My question is: is it OK to keep them inside their coop always? How much lighting do I need to supplement what comes in the window? The stall is about 130 square feet and I have 13 hens in there.