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Topic Title: Security lights
Topic Summary: Flashing on and off
Created On: 05 November 2012 09:33 PM
Status: Read Only
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 05 November 2012 09:33 PM
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Joined: 24 January 2008

Evening all

Been to a customers house last week who have got 2 x security lights out on the front of the house.

They are the twin 150w type with one PIR.

They are fed from the same supply/switch and come on at night when they detect motion.

The weird thing is that they flash maybe 15-20 times just before they go off? Not a flicker, but a controlled flashing sequence.

I don't know the make and haven't checked the supply, but just wondered if any of you guys have come across this before?

I think the sensor is faulty, but its a bit odd that both have gone in the last 3 months. The fittings are 5 years old.

A friend of the customer who works for a lighting company has said he thinks the relay has gone??

Any ideas would be greatly appreciated.

Many thanks in advance.

 06 November 2012 08:43 PM
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This might be a long shot, but are there any wireless devices? For example, if you have a battery powered PIR that switches a remote lighting reciever, a series of flashes could be an indicator code for something like a 'low battery' warning.

 06 November 2012 10:35 PM
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Have they a shiny new van parked near them? Or have they had a conservatory fitted ?


Resistance is futile.
 06 November 2012 11:57 PM
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They don't like cold weather.

 07 November 2012 09:23 AM
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I've seen PIRs do odd things when they can 'see' a lamp that they're controlling - either the heat coming/going triggers the PIR itself or the light upsets the day/night sensor.
- Andy.

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