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It might be an LED or possibly just a bog standard old 40w bayonet bulb I had around as I remember changing it a few years back. It is on at max a couple of hours a month if that. The PIR might be on more due to the family of foxes that run past in the night. I'm fine with the old bills at £90 (which were split two ways) but £1450 is taking the piss.
PQR-
£1450 is taking the piss
It might not be.
That's the problem.
It might be that there was an LED, and it was only on a couple of hours a day. Then it was changed for an incandescent bulb, and actually left on overnight a hell of a lot.
That wouldn't come close to £1450, but if their billing is retrospective then they may have bumped to £750 to catch up on arrears for a couple of years of underpayment (electricity in the region of £350 per year), and then when they see it increase again they could be bumping again to get ahead of it.
But... more interestingly, you said they want to see the meter... so the communal leccy is on a distinct circuit with it's own meter, great... so just ask to see the costs, to see the bills they received. Simple as that.
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Ours is budgeted at £610 this year, in a 4 storey block with 7 flats. Whenever anyone comes in the front door the PIR lights up about 50 lights all the way up the stairwell, we also have a lift.
Velocio
mustardbeak
PIR cost would be invisible. Barely a couple of £ over the whole year.
Light bulb cost can be calculated here https://www.electricalcounter.co.uk/light-bulb-running-costs
What bulb type do you have? LED makes sense for communal area