Every now and then I would
look over towards our coop before going to bed and notice the supplemental
light still on.
At first I thought maybe the
chickens figured out how to work the timer, but eventually settled on
some kind of intermittent failure in the mechanical timer.
I suspect the mechanical
timer was intended for indoor use only and might behave differently
when it gets frozen. I'll post an update in a month or so to check on
the performance of the new digital timer.