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It's my understanding that the light will only stay on for the length of time set by the time knob. So set the time knob to 3 mins, dusk to around the light level when you want it to operate, sensitivity depending on the position and where you want movement to have a reaction. Your reading of the instructions doesn't make any sense to me. No one wants a PIR to come on at dusk and stay on all night, that's what the motion sensitivity and timer are for.
I've had some luck with separately wired PIR units and standalone lamps. They are a problem if they're on a switch that can be operated by the uninitiated though. Some of them have a mode where you can switch on and off quickly and it will come on all the time or stop coming on altogether.
At one point I had a guy at the wholesalers counter tell me they are sensitive to polarity and require earthing to work reliably. Not sure on the wisdom of that.
Don't want to jinx it but we had problems with one that was wired to a switch in the hallway until I put a permanent feed in for it, since then it's not missed a beat.
I try to avoid having anything to do with them.
Airhead-
Having re-read the instructions I reckon you're right. Setting it up at 8.30pm, having been fasting all day, didn't have me at my most cognisant.
It's on a permanent feed (it's own dedicated circuit which is nice!), unswitched. I think it's all down to poor reading comprehension on my part, lol. Back to replace an outside socket there later so will get it sorted! Thanks for the help/ability to read.
I try to avoid having anything to do with them.
I'm not having much joy with lux and PIR sensors so far, that's for sure!
Nef
They've got outside lamps at the back on a switch, but wanted to replace their old PIR lights with something similar. Bought some slightly more expensive Brackenheath ones to replace the LAP landfill that had previously been installed (terribly), but I think they're only marginally better.