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From: Fred Bloggs
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Subject: Re: Triac controlled holiday lights
References: <email@example.com> <firstname.lastname@example.org> <3DEB8034.email@example.com> <firstname.lastname@example.org> <3DECCCDF.email@example.com> <3DED7F7E.firstname.lastname@example.org>
Date: Wed, 04 Dec 2002 04:23:03 GMT
NNTP-Posting-Date: Tue, 03 Dec 2002 20:23:03 PST
Organization: EarthLink Inc. -- http://www.EarthLink.net
Phil Allison wrote:
> "Fred Bloggs" wrote in message
>>Phil Allison wrote:
>>>"Fred Bloggs" wrote in message
>>>>Right- but those were for bulbs rated for 120VAC. The half-wave
>>>>rectification cuts the RMS down to 70% of that or 84VAC. In your case,
>>>>you would have 84VAC across a string rated for 60VAC, and this will be
>>>>bad news. My dimensions were off in the original post, but if the bulbs
>>>>are rated at 700 hours on 60VAC, then 84VAC will reduce their lifetime
>>>>to 12 hours.
>>> ** No, much less than that with a 40% overvoltage.
>>> The 2 to the power of 12 rule is only valid for small voltage
>>> You must have missed that one at Uni Fred.
>>It is not a 2^12 rule, it is the (voltage ratio)^12 rule, and in this
>>instance it is good for concluding with great confidence that 84Vrms is
>>way out of bounds.
> ** Then you should have posted *that* and not the erroneous figure you
It's called a *persuasion estimate*- no point in exactitude to the
pointlessness of absurdity.
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