In message , Mike Barnes
writes
AAMOI, how do you know they couldn't take a CFL? Is it an electrical or
a mechanical problem? We have two such lights (PIR-operated bulkhead
lights), different designs, and I fitted them both with CFLs a couple
of years ago, no problem.

Might have been triac operated. The CFL load would cause latching and
triggering problems.

--
Clive Mitchell
http://www.bigclive.com