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I
have
just bought some 50w 12v halogen bulbs and fittings ... they're going to be
running from an LW11G German style wall light switch but I've also tested
them
on a mechanical dimmer too and they exhibit the same "problem" on
both.
The
problem is that the lamp unit itself buzzes when the lamp is dimmed ... at
full
brightness they make no noise but when dimmed they buzz loudly - the
buzzing can
be eliminated by holding the ceramic connector that goes onto the back of
the
bulb between the fingers. I have other 12v halogens that are not the same
design
but do not buzz when dimmed - my question is, is this "normal"
behaviour?
It is definitely not the transformers that buzz however they are electronic
ones
and possibly that is the reason - would wound transformers
help?
I
would have used 240v halogens but can't as I need a tight 8 or 10
degree beam to use as directed reading lights and I have been unable
to
source that design of 240v bulb.
Phil
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