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What is an outdoor light with a PIR sensor?


grey_christian
(@grey_christian)
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I have a new light that has a 'PIR' sensor - what does that mean?


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Charlotte
(@charlotte)
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A PIR sensor is a type of motion sensor.


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Cynthia
(@cynthia)
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PIR stands for "Passive Infrared", and means that the sensor detects movement by heat changes, in other words if something with heat (like a human body) moves in front of the sensor, the heat differential will set it off. 


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bing_martina
(@bing_martina)
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PIR is passive infrared.

Infrared is the band of electromagnetic energy which we feel as heat.

Passive is because the sensor just sits there, it does not emit energy.


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jones_ethan
(@jones_ethan)
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PIR is a sensor that uses heat.

Most PIR sensors work between 5m and 12m, depending how sensitive they are.


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wright_henry
(@wright_henry)
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The great think about PIR sensor is that they are only sensitive to heat, so for example branches or leaves flying past will not set it off.


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