Even traditional filament lamps will sometimes short circuit when the
filament breaks, causing the MCB to trip. Less likely if the bulb has
an integral fuse in the base, but many haven't these days. AIUI as the
filament breaks, the arc that forms momentarily between the two ends
of the broken filament vaporises enough tungsten to provide a highly
conducting path between the wires supporting the filament, in effect
causing a short circuit.
I imagine that the chip in the lamp that regulates the current in the
lamp itself just can't cope.
Such a type of short circuit might reasonably be expected to
occur. Perhaps not every time but, say, half of the times a bulb
It seems a bit unreasonable to sell a lamp that will no longer
work after a few bulb failures.
The wretched lamp only takes halogen or tungsten bulbs, so it's
not as if I could have used anything else.
It's not uncommon - repaired some at repair parties.
Owners have obtained replacements from ebay via China.
The last one I helped with a couple of months ago, the guy
had ordered two different ones (I think they were under 2
quid each). It was a good job he did, as I refused to use
the one which didn't have a Class Y capacitor on the
connection to the lamp body, and you simply can't tell
that sort of thing until you have it in your hands.
[email address is not usable -- followup in the newsgroup]
I'd say no, but it depends on how the bulb fails. I don't think many dimmers
like a very hard short for more than a split second. I once bought a job
lot of 100w bulbs from a corner shop, branded Tesla. Every one of those
blew short, dead short took out three dimmers and popped breakers, so after
the replacement of the triacs in all the dimmers, relegated the bulbs to
the shed instead.
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