Re: Using mobile phone as an internet radio

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#75

From: John Robertson
Date: Wed, 03 Oct 2012 07:59

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Jeff Liebermann wrote:
> On Wed, 3 Oct 2012 09:28:13 +1000, "Phil Allison" <phil_a@tpg.com.au>
> wrote:
> 
>> "Graham."
> 
>>> An incandescent light bulb is a good example, If it lasts 1000 hours
>>> when run continuously, its life will be considerably shorter if run
>>> (say) 4 hours a day and the time it is on added up.
>> ** Where ever did you get that nonsense from ??
> 
> It's not nonsense.  The inrush current of a cold filament can shorten
> the filament life.  That's why light bulbs usually blow up when you
> turn them on, not while they're running.  The induced magnetic field
> also tends to "twang" the filament, which can break the filament if it
> were somehow mechanically weakened.
> 
> While attending kollege in the 1960's, I worked for a short time as a
> non-union projectionist at a movie theater.  Besides babysitting the
> projectors, I had to deal with the flashing light bulb marquee.  I
> vaguely recall that there were something like 2000 40 watt light
> bulbs.  Roughly once per week, my job was to replace the blown bulbs
> from a rickety pre-OSHA 20ft wooden ladder, sometimes at night.  I
> didn't keep count, but every week, we would lose about 20 light bulbs.
> Doing the math, that means after about 2 years, ALL the light bulbs
> would have been replaced at least once.  At 8 hrs run per day, that's
> 800 hrs lifetime which isn't all that great, especially since we were
> running the bulbs at reduced voltage to improve the lifetime.  We used
> the same bulbs in the theater foyer and lobby, where they were NOT
> cycled on and off like the flashing marquee.  I rarely replaced those
> bulbs and they seemed to last forever.
> 
>>     Some web forum ?
> 
> If you repeat something often enough, it eventually becomes dogma.
> 

Well-designed lighting circuits provide 'keep-alive' voltage to the 
filaments to reduce most of the inrush current. Might have put you out 
of that job though...

John :-#)#

-- 
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Subject: Re: Using mobile phone as an internet radio
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