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However, if they are inclined to spend time indoors because of bad weather or a small run, having more windows in your coop WILL effectively extend their day somewhat, compared to a dark poorly windowed coop. Reason being, if there isn't all that much daylight getting in, the indoor "dawn" comes a lot later and "dusk" a lot earlier. Windows and skylights will never increase effective daylength beyond what the sun and season provide but they can at least prevent your days from being *shorter* (from a chicken perspective).
I still see no possible advantage of skylights though. When windows are SO much easier. Those who are saying they don't leak, how long have you had your skylight in commission? They do not always do it right away, but just about all of them, even the translucent roof panels IME do start leaking around the edges with time, like a year or five years. And those leaks are not generally very fixable. (I am talking about any application you're likely to do in a chicken coop -- it is *possible* to keep a skylight leakfree for ten or twenty years in a house roof, although frankly that is probably more the exception than the rule, but I don't think you want to spend quite that much money or aggravation in a coop...)
JME (and this is with lots of skylights in OTHER peoples' barns, not a comment on my own construction skills <g>),
Pat