A. There’s nothing unclean or unacceptable about motion sensors. But they do present a one day a week problem to a Sabbath observant Jew. Those who are strictly observant do not manipulate or change electrical devices on the Sabbath. We can benefit from lights, but we can not alter them (on/off). A photo-sensor is OK, since it works automatically without our involvement, but a motion-sensor goes on because we walked by, unless there’s an override for the Sabbath.
