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Outdoor lights can provide valuable protection for the homeowner against break-ins and can increase safety. Use infrared motion detectors (IMDs) to turn on outdoor lights. They are programmed to react to the body heat of humans and, when any motion is detected in a monitored area, they will turn on. They will not be triggered by animals passing in the night. Infrared motion detectors sense motion up to 70 feet away and should be installed above the ground in a tree or near the roof to cover a broader area.