Also, I guess you know this, you must not touch the glass envekope of the
bulb at all with your fingers ever. If you do, they need to be cleaned with
meths. This is because grease from your fingers causes localised heat build
up and early bulb failure.
get a multimeter, set it to an AC range of 20 volts or so, and connect it
across the bulb with the bulb still in (a couple of pins can be handy here)
turn the lamp on and check the voltage (somewhere around 12 is ideal)
Sometimes when transformers fail they can give out substantial extra
voltage, before dying completely.
If you have energetic kids like ours, every now and again antics in the kids
bedroom (not what you might think!) were causing a vibration in the ceiling
and I noticed the bulbs had a tendency to blow when that happened. Quite a
few bulbs went until I had words. Of course it might be totally unrelated to
I've had same problem, 240V halogens costing a fortune a year to replace.
Improved things greatly with softstart units (www.tlc-direct.co.uk) , but
eventually ripped whole lot out and replaced with 12V halogens and torrodal
transformers. That was 5 years ago and all 18 halogens are still working,
not had one go.
I had similar problem, both transformer (12V) and transformer-less
(240V) bulbs were blowing. Mains voltage too high, if I recall right it
was 245V. I fitted an autotransformer to the lighting circuit, 100VA,
about 10V reducing voltage.
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