Colin Brook wrote:
Hello, I've had this problem for a while with one bulb; I spoke to
Philips technical help line who said that this happens from time to
time
with particular specimens of the bulb - change the bulb to a different
one and it goes away. It occurs when the bulb is used in a two or
multi-way switched environment and the rest of the explanation about
voltage build up leading to the bulb thinking it was going to strike
but
then not was not, for me, very complete or convincing.

Possible- I guess the bulbs are very high resistance when off, so induced
voltages won't dissipate. The unit then gets to the point where it sees 240V
on the input and tries to switch on, but as soon as it draws current it
loses the voltage. If so, shoving a resistor in excess of say half a megohm
across the screw terminals in the light fitting would stop the flicker. With
a light that shows repeatable flicker you could then increase the resistance
to get the highest possible value (hence smallest waste current when on)
that solves the problem.

--
Dr. Craig Graham, Software Engineer
Advanced Analysis and Integration Limited, UK. http://www.aail.co.uk/