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The Medway Handyman

wrote:
The triac probably went short-circuit if the old bulb blew.
It is usually a metal-tabbed device such as a TIC226.- Hide quoted
text -

I had one fail in exactly this way. The triac shorted as a result of
the very high current which flowed when the bulb blew and arced
internally with a bright flash and a pop. I looked up the data for the
triac. It did not have a surge rating anywhere near high enough to
survive this kind of fault, especially with the lamp close to the
consumer unit (the lamp was in the hall in our case).

B&Q replaced the first one, but refused to replace the second which
was just over a year old when the bulb blew. The manager insisted
that nobody else had ever reported such a fault SNIP

Did his nose grow longer as he said it?

Bloody things are nothing but trouble.

--
Dave - The Medway Handyman
www.medwayhandyman.co.uk