P.I.R. Operated Outside Lights.

PIRS.. use insulation tape on the sensor glass to reduce coverage, keep them pointed downwards to reduce coverage, remove nearby shrubs and  branches, employ a sensible electrician who understands the physics of wind. 

Legh

Depends what's triggering them. Often it's trees/bushes blowing about in the wind that screen (or not) something of a different temperature behind them (e.g. a heated building) - fooling the PIR into seeing the changes in warmth they're meant to respond to. If movement infront of the trees/bushes isn't needed to trigger the lights then re-pointing the sensor to void the trees or masking part of the sensor with tape can help. Or cutting back the bushes, so they don't move so much.

   - Andy.

I must say that it can be very difficult to get the balance just right - on when somebody approaches, but not affected by wind.

Here, foxes (and possibly badgers) trigger some of the PIRs. ?

We have inherited a hedghog who with various neighbourhood cats which constantly patrol around the outside of our house. All the animals trigger the various PIRs installed carefully. The hedgehog appears to be the most elusive, zipping past our kitchen doors at what appears to be an excessive speed.

You could of course provide a screen surround to further reduce the spread of PIR sensitivity.

Legh

Ys Passive infra red is actually the “wrong” technology for outside because it`s looking for changes in temperature in it`s field of view over a certain timeframe. you give the duration, the amount and the speed maxima and minima to try to cater for certain factors and it`s all a bit of a compromise. you end up with a unit that works reasonably well a lot of the time, but sometimes the extremes kick in and throw it about. If the result is a false trip or two every now and again it is quite tolerable. Connecting it to an intruder alarm system though would be an absolute nightmare. That`s why we connect them indoors to alarm systems where the limits are more controllable and outside is a bit of a fudge really

ebee: 
 

Ys Passive infra red is actually the “wrong” technology for outside because it`s looking for changes in temperature in it`s field of view over a certain timeframe. you give the duration, the amount and the speed maxima and minima to try to cater for certain factors and it`s all a bit of a compromise. you end up with a unit that works reasonably well a lot of the time, but sometimes the extremes kick in and throw it about. If the result is a false trip or two every now and again it is quite tolerable. Connecting it to an intruder alarm system though would be an absolute nightmare. That`s why we connect them indoors to alarm systems where the limits are more controllable and outside is a bit of a fudge really

Perhaps a break beam outdoor detector system would be better to detect intruders.

Z.

 That`s why we connect them indoors to alarm systems where the limits are more controllable and outside is a bit of a fudge really

I have a preference for a dual type detector for intruder alarm systems indoors, that reduce considerably false alarms.

Z.

Microwave sensors, if you can get them.