No need for a light unless it has a camera that needs the light. Normally
the leds are infra red.
I think the Ring Door bell uses infra red leds.
Brian

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The Sofa of Brian Gaff...

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"ss" wrote in message
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I am hoping to use a cheap PIR to monitor outdoor activity at night, but
the one I have appears to be too sensitive, it doesnt have the usual
adjustments so may try and block some of the lense range.
Anyhow I opened it up and there is a sensor and then an LED `bulb` which
comes on when activated. Is the LED light necessary for it to operate as
I would prefer it didnt light up if someone is snooping around my back
garden at night.

It is a wirless battery operated cheapo whereby the sensor is in the
garden and the receiver is wireless in the house.