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How do Motion Sensing Lights Work?

Updated: 8/19/2019
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13y ago

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Motion sensing lights use a passive system that detects infrared energy. These sensors are known as PIR (passive infrared) detectors or pyroelectric sensors. Human skin averages to be 93 degrees F, which radiates infrared energy in a wavelength that is between 9 and 10 micrometers. The sensors dectect quick movement of objects that radiate between 8 to 12 micrometers of infrared energy.

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Q: How do Motion Sensing Lights Work?
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