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From: John Woodgate
Subject: Re: Current draw of several light bulbs?
Date: Wed, 11 Dec 2002 23:36:45 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Thu, 12 Dec 2002 06:28:54 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Tony Williams
wrote (in <email@example.com.
uk>) about 'Current draw of several light bulbs?', on Wed, 11 Dec 2002:
>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.
What happens with high-reliability lamps for traffic signals is not
necessarily the same as for small indicator lamps.
Until our traffic lights went solid-state, many were run from soft-start
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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