On Mon, 24 Apr 2006 11:21:57 +0100, Guy King
had this to say:

The message
from "Mary Fisher" contains these words:

You can adjust/mask the sensor so it only goes off when you want it to.

Loses the point, really!

No it doesn't. We've a PIR by the front door, but unmasked it reacts to
people walking along the footpath outside. Masked it only lights as you
walk through the gate.

There's a street nearby where if you walk along the footway in the
evening, PIR "controlled" lamps on both sides of the road at two
particular houses activate almost simultaneously, even though the
gardens are reasonably long.

--
Frank Erskine