From: Spehro Pefhany
Subject: Re: Current draw of several light bulbs?
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Date: Wed, 11 Dec 2002 23:21:01 GMT
NNTP-Posting-Date: Wed, 11 Dec 2002 18:21:01 EST
On Wed, 11 Dec 2002 23:13:31 +0000 (GMT), the renowned Tony Williams
>In article ,
> John Woodgate wrote:
>> You don't need to uprate the transformer, because the inrush last for
>> only a few milliseconds, but it kills lamps rather frequently. That is
>> why I recommend a thermistor.
> This has been vigorously debated in another newsgroup.
> The problem with "inrush kills bulbs" is that the
> accumulated data on traffic lights has shown that
> the amber bulbs have about the same life as the
> red/green bulbs. There are several URLs giving
> this data, but I never bookmarked them.
> "Inrush kills bulbs" seems to come from the fact
> that they always seem to blow at switch-on. It is
> more probable that the bulb was on its last legs
> and would have blown shortly anyway.... the inrush
> just gave it a fractionally earlier coup de whatsit.
That's been my conclusion as well, though I'd be more than
pleased to see any solid evidence to the contrary.
Maybe traffic lamp filaments run particularly cool, for example.
But I'd expect the same to be true of pilot lamps.
"it's the network..." "The Journey is the reward"
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