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Thank you for the replies. Whilst I agree that the PIRs are looking for moving IR sources, my concern is that by flooding the room with IR light that the sensitivity of the PIRs would be reduced. However, it appears that the PIRS are looking for IR in the 5 - 14μm wavelength range...

Hello, Apologies if this has been asked before, I did search the forum but could not find any similar topics. I have some internal wireless cameras with inbuilt IR LEDs which activate at night. These are positioned in the same areas as my alarm system PIR sensors, facing towards the...