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From: davis@hplabs.UUCP (Jim Davis)
Newsgroups: net.consumers
Subject: Re: Lifetime Lightbulbs
Message-ID: <1516@hplabs.UUCP>
Date: Wed, 30-Jan-85 02:45:58 EST
Article-I.D.: hplabs.1516
Posted: Wed Jan 30 02:45:58 1985
Date-Received: Thu, 31-Jan-85 01:47:28 EST
References: <-28400@cadovax.UUCP> <6100001@hpfclv.UUCP> <1467@hplabs.UUCP> <647@aluxe.UUCP>
Organization: Hewlett Packard Labs, Palo Alto CA
Lines: 21

> ****                                                                 ****
> From the keys of Steve Henning, AT&T Bell Labs, Reading, PA aluxe!2141smh
> I've also heard that light bulbs that last forever can be made
>   you can insert a diode in the line to effectively  halve the power
> You can also buy 130V bulbs to accomplish much the same thing.

    Here's one point that hasn't been made yet.
The use of a diode changes the current going through
the bulb from AC to pulsating DC.  If that current
is smoothed out (e.g. a full wave rectifier and/or
a capacitor) then one has direct current.  One of
the causes of light bulbs burning out is the
stress on the coils in the filament caused be
electro-magnetic interaction (though startup shock
is still a big killer).
-- 
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	Jim Davis (James W Davis)
Email:	{any_of_the_biggies} !hplabs!davis
Arpa:	davis%hp-labs@csnet-relay
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