PIRs and table lamps

Sep 03, 2014 5 Replies

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ss 11 years ago

I have a yale wireless alarm system with PIRs. Now when I go holidays it was my intention to connect a timer to a couple of table lamps obviously to come on for a few hours when its dark, would this set off the alarm? Similar question I have an outside LED floodlamp and although it doesnt point directly towards the internal PIR in a particular room it would show increased light on that window. I have aneighbour who has access should the need arise but dont want to have issues if I can avoid them.

Any thoughts?

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Fredxxx 11 years ago

PIRs rely upon temperature rate of change and movement. A CFL bulb should only heat up or cool down slowly. I have never heard of a PIR sensor being sensitive to a stationary CFL light bulb.

Glass is opaque to long wave IR so no thermal energy from a flood light will pass through a closed window; again I see no problem.

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Brian Gaff 11 years ago

Pirs usually monitor movement acros a matrix not changes in light surely, so I don't see a problem at all. Brian

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meow2222 11 years ago

PIR lenses turn movement across the scene into changes in IR/light level seen by the sensor.

IME PIRs sometimes do react to a light switching on in their field of vision, sometimes not.

I'd guess that shielding pir's direct view of the lamp would probably fix it. Guess.

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ss 11 years ago

Thanks all for replies, I guess I should set it up and test before I go on hols. The neighbours are early bedders and last thing I want is for them to get up in the middle of the night to reset it.

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Huge 11 years ago

At least it never has in this house.

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