In article ,
Abdullah Eyles wrote:
It would depend on the design of the timer or sensor. The way round using
any sensor with one of these is to add a relay.

The electronic timers contain a "Triac" as the switching element;
these cut the mains waveform to switch off/on. Because the Energy
Saving bulbs have transformers in them, they present an inductive
load, thus preventing the triac from switching off correctly. This is
the same for fluorescent tubes as they contain a coil (ballast)...

I'm not sure if adding a relay will solve it, because the relay may
behave in the same way...

You mean it will be an inductive load, or switch on and off at double
mains frequency?

In practice, neither is a problem.

--
*Do they ever shut up on your planet?

Dave Plowman London SW 12
RIP Acorn