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I've got a standalone PIR out back controlling 3 LED floodlights, 2 are 40W and the other is 10W. The 10W one is behaving a bit weird, it's coming on at reduced power when the others are off. Activating the PIR makes it come on properly. It seems to be getting brighter in it's low power state. It's possible the others are also coming on but I can't see them easily without triggering the PIR. Didn't do in November when I first installed it. I'm assuming it's the PIR not switching off properly, effectively leaking electricity. Any other ideas or before I just replace the PIR?
The 10w light is probably below the latching capability of the circuit in the PIR, it's likely designed for halogen lamps consuming 50-150w or such.
Additionally, the way the LEDs draw current may also not match the draw of a simple filament lamp (resistive).
I'd try wiring it up again, but yes you may need to replace it with something that is designed for LEDs. This is also a common problem with LEDs and dimmers.
Thanks, that makes sense, been Googling them, found one that goes down to 0.1W which should do the trick.
Induced voltage / capacitance. It's a regular occurence with LED lamps.
They light up dimly with very little current - 5mA will light some.
The cables are giving off a magnetic filed, the one to the errant LED is picking that up, then turning that into a very small current, hence the LED lights up dimly.
Most commonly seen on the light at the top of stairs that has 2 way switching.
To fix it, move all cables supplying the LED away from other cables, fit a snubber, or stop worrying about it. It used to happen with filament lamos too, but you could not see that as they need far more power to make the filament glow.