If you have ever visited a new public restroom, you probably have encountered a motion sensor. They are become more and more popular because, through the use of infrared sensors, they help conserve energy by activating the lighting only when motion is detected. (Some are a little over-effective, however. It’s never fun to get caught with your pants down… literally.) Motion sensors are ideal for safety and security (mostly exterior), and they are also a great way to save energy in both residential and commercial applications. You can use them anywhere people spend short amounts of time: a closet or storage area, a utility or laundry room, an attic, the aforementioned bathroom, etc. Essentially, motion sensors keep lights off when they are not needed, so they conserve energy and cut down on light pollution. Can’t beat that.