Let's think about a regular motion sensor first. Yes, they detect motion and turn on lights. You can set the sensitivity so little things don't set them off. The problem I see with them it when things like tree limbs, tall grasses, heavy snow, heavy rain and the like, keep setting them off in the middle of the night. Is there anything better that can determine the difference between those instances and humans approaching? The answer is yes! With the newer style sensors, they can actually check for body heat using infrared rays. When someone approaches, they turn on the lights.
...Source: http://electrical.about.com/b/2014/02/11/2926.htm
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