How PIR lights work
A PIR (passive infrared) sensor detects heat and movement. When someone walks into its range, the light switches on for a set time. Most include a light sensor so they only work after dark.
Positioning matters
- Mount high enough to be out of easy reach, but within the sensor's recommended height
- Aim at paths, doors and drives you actually use
- Avoid pointing at the road, where passing cars and people will trigger it
- Angle the light downwards so it doesn't glare into neighbours' windows
- Keep sensors away from trees and bushes that move in the wind
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Settings to tweak
Most PIR lights let you adjust how long they stay on, how sensitive they are and at what light level they start working. A minute or two is usually plenty. Very high sensitivity can mean cats and foxes set them off all night.
Installation
Replacing an existing outdoor light with a PIR version is often straightforward. New outdoor lights may need a new circuit or an extension of an existing one, with RCD protection and weatherproof fittings.
