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From: firstname.lastname@example.org (Don Klipstein)
Subject: Re: diagnose florescent light
Date: Thu, 26 Dec 2002 07:04:30 +0000 (UTC)
Organization: MGT Consulting
NNTP-Posting-Date: Thu, 26 Dec 2002 07:04:30 +0000 (UTC)
User-Agent: slrn/0.9.6.3 (SunOS)
In article ,
>Rick Merrill wrote:
>> Is there any way to tell if a certain florescent light
>> has a bad switch or a bad BULB? (other than testing the
>> bulb in another lamp)
>> Bulb has 4 pins: only 2 show continuity.
>> Socket shows no AC voltages (converter in lamp?)
>The 2 pins at each end should have similar resistances, as they
>are connected to heaters.
>One set being OC would indicate that one has blown, meaning that usually
>the bulb won't work in most fixtures.
How true, although usually in my experience a fluorescent bulb dies with
its filaments intact.
What usually happens is that the thermionic emissive coating on the
filaments wears out. You usually see a noticeable area of darkening at
one end (less frequently both ends) of a dead fluorescent bulb. This
severe darkening usually forms in the bulb's final hours. Do not confuse
this with the mild darkening that usually occurs at both ends over the
life of the bulb.
- Don Klipstein (email@example.com)
http://www.misty.com/~don/f-lamp.html (Sam G.'s fluorescent lamp FAQ)
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