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Motion sensors automatically turn outdoor lights on when they detect motion and turn them off a short while later. They are very useful for outdoor security and utility lighting. Because utility lights and some security lights are needed only when it is dark and people are present, the best way to control might be a combination of a motion sensor and photosensor.
You do not want the sensor detecting slower changes, like the sidewalk cooling off at night. Your motion sensing light has a wide field of view because of the lens covering the sensor. Infrared energy is a form of light, so you can focus and bend it with plastic lenses. But it's not like there is a 2-D array of sensors in there.