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The main disadvantages of a motion sensor are that:

It might not cover a full room.

Things may trigger the motion detector that you don't want to. An outside detector mounted too close to a light that stays on at night, will be triggered continuously by bugs.

The set shutoff time of the motion sensor may be too short (maybe only 30 seconds). For outside lights with a motion detector, if you want more "on time", it's best to buy a model with an adjustable shutoff time.

The reliability of a motion sensor may also be affected by rapid environmental changes and direct sunlight. Also, things like a fireplace, and direct wind from an air conditioner or heater. This is because a PIR sensor actually detects changes in infrared energy - specifically, the "heat energy" emitted by normal human skin temperature.

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Q: Disadvantages for motion sensor
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