On 1/25/2013 1:18 PM, Doug wrote:
On Fri, 25 Jan 2013 09:22:57 -0800, Bill
wrote:

In article , says...

In another thread, it was mentioned that CFLs and LEDs
last longer than incandescent bulbs.

We all know incandescent bulbs fail due to the filaments
being made so thin that they oxidize and burn up, over time.

But, what causes CFL bulbs to fail?

And, what causes LED bulbs to fail?

Greed on the part of the manufacturers (for all light bulbs which do not
last long). The bulb burns out, you buy a new one and they make more
money!

This bulb has worked for over 110 years...
http://en.wikipedia.org/wiki/Centennial_Light

I remember back in the 70s seeing a tour of Thomas Edison's Florida
home and they had a bulb of his burn so many hours a day since he
left. I guess it was like 50+ years then and still burning well. So
I got to believe what most people say in this thread as true.


Not really, if you burn an incandescent lamp below its design voltage
you will see the color shifts to yellow because the filament is much
less hotter and much less efficient as an illumination source but it
also last for a lot longer.