I live in a rural community, as well. We don't have the co-op security lights, as we live inside the township limits, so we have street lights. However, with it being 20 feet high, and you'll have a roof on the coop, that will block most of the light. In fact, as the days get shorter, you'll actually want to have additional light available for the chooks, so they'll continue to lay during that period. They need to have at least 16 hours of light a day to lay year-round. It doesn't have to be bright daylight... just extra light to make them think the days are getting longer. I actually have a string of bright light LED Christmas lights up inside the perimeter of my coop (8x12 shed) which provides them all the extra light they need, on a timer so that it comes on at 4 am, off by 7 am, on again by 5 pm, off by 9 pm. I like it, too, because I can see just fine if I need to check on them for any reason. They go to bed at the usual time, so it doesn't bother them. I check on them, and they're already on their roosts.