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Can anyone beat 20W CFLs @ 8 pence easch ? - Page 8

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Posted by vaughn on May 18, 2009, 9:29 pm
 


   Why not?  It seems to me that the lifespan of the lamp and the lifespan
of the electronics in a typical CFL are pretty well matched.  So when one
goes out, it is probably time to replace the other.  Also look at the
economic reality; since packaging, shipping, handling, and store costs are a
major part of each lamp's cost, replacment lamp coils would probably cost as
much as a complete lamp.

Vaughn







Posted by Joesepi on May 18, 2009, 10:24 pm
 
Why would the electronics need replacing?

Seems to me the high frequency digital chopping inverter circuits (if I
estimate that right) would last almost forever. Capacitors may be a sore
spot under the high temperature usage though.



Posted by vaughn on May 18, 2009, 10:30 pm
 

   Unfortunately, it don't work out that way.  Everything has a MTBF.


   Yes, especially the capacitors.

Also, don't forget the economics!


Vaughn



Posted by Eeyore on May 20, 2009, 7:48 pm
 

vaughn wrote:


I have some recollection that the bathtub curve for semis starts rising again
at about 100,000 hrs usage under 'typical' conditions.

Electrolytic caps are another story, but the tube will be blackening after
15-20,000 hours for sure.

Graham


Posted by Eeyore on May 20, 2009, 7:46 pm
 

Joesepi wrote:


Pretty much.



I'll bet it's those electrolytics.

Graham


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