The message
from "gentlegreen"
contains these words:

I want to fit a PIR in my new stairwell to switch the lights on. I suspect I
will use a bog standard B&Q security light minus the light - I'm guessing
specially-designed "occupancy sensors" are expensive.

The ain't cheap. I have one in the downstairs loo.

Oooh, look, while googling for a price I found this...

http://www.screwfix.com/app/sfd/cat/...51243&ts=96986

A security light that does LE lamps.

--
Skipweasel
Pay no attention to that man behind the curtain.