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Subject: Re: Halogen bulb drive
Date: Wed, 25 Sep 2002 01:55:41 +0100
References: <4LPj9.email@example.com> <firstname.lastname@example.org>
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"Phil Allison" wrote:
>> DC voltage across the lamp also causes thinning at one end.
> ** Have you any published figures on this? Is it a factor at 12 or
If this were a significant factor then all dc driven filaments would fail
at one end - news to me if they do.
I did quite a lot of research on small halogen lamps some time ago. I came
across a mention of this ac/dc phenomena or rumour - I didn't find anything
Also came across soft starting extending lamp life stories without any
serious grounding. Yes they often fail at power on but only when they are
about to expire anyway.
The most significant factor in life (ignoring mechanical vibration and
shock) is applied voltage. Life being inversely proportional to 12th power
of the ratio of specified and applied voltage.
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