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Can any one help? I purchased a solar powered PIR security light, with the intention of putting it inside my kitchen window. The PIR would be inside the window, but this does not work.

When I go outside to activate the light, it does not work. When I go inside to run my hand across the sensor, it works.

Will a PIR unit penetrate glass, or am I barking up the wrong tree?

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2 Answers 2

Passive infrared sensors (PIR), use Infrared (IR) light to detect motion. Unfortunately for you, infrared light does not travel through glass so well.

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Especially if you have that nice new highly energy efficient e-glass. And man sakes alive, walk though the reflection one sunny morning at sunrise to feel the reflective efficiency. –  Fiasco Labs Mar 29 at 1:13

This tree, not the one you should be barking up, is.

PIRs do NOT work though glass. Put it outside.

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This particular pir unit with led lights has not got a very good IP rating any idears –  user20714 Mar 28 at 17:32
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Without knowing which particular one you are talking about (there is no link, model number, etc. given), if you can mount it up high under the eaves (or other roof overhang) that helps to keep it dry - that's assuming you can put the solar panel part somewhere that it can get sun (easier if separate, harder if attached.) Or, return it and buy a better one. Sometimes cheap is just cheap, not a good value. –  Ecnerwal Mar 28 at 17:39

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