Off at 9 PM I ASSUME since on at 7 AM and off at 9 AM would have the light on after the sun comes up. Actually, it still doesn't make sense since at least here at the moment sunrise is about 7 AM and sunset at 7 PM. No reason to have a light on all day.
7am on then off at 9 pm it is because we go out with the dogs at 9 pm the last time for the night and close chickens in, the silky coop has a light rarely turn it on.. 3 in silky just 5 in the main coop made changes in nest boxes we will see how upset the next few days