CFL's

[Jeremiah McCarthy-2]

The CFL that failed for me was a 22 watt GE, was made in China, and was not in a hooded desk lamp...It was in a table lamp with a12 inch open-top fabric lampshade sitting on a living room end table...I was not putting CFL's down, I was trying to warn folks to keep an eye on them for signs of over-heating...I have been using them for at least 10 years and will continue to do so, but one thing is for sure, I no longer leave a CFL burning when I am away from home overnight...It will be an incandescent for as long as I can get them...They are trying to "outlaw" incandescents in NY now...

 

Again, these bulbs contain mercury and it is illegal in NY to dispose of them in the regular trash...We have to deliver them to the hazardous waste material facility where we also have to deliver computers, printers, TV's, etc...There is no curb pick-up for these items...

 

Jerry, wa2dkg

 

Message: 27
Date: Sun, 5 Oct 2008 09:43:19 -0700
From: "Ron D'Eau Claire" <[hidden email]>
Subject: RE: [Elecraft] smoke test
To: <[hidden email]>
Message-ID: <[hidden email]>
Content-Type: text/plain; charset="us-ascii"

Jim gave you an excellent analysis of what happened to your CFL. That
fixture might have contributed to the failure, and I'd be suspicious of it
unless that CFL is several years old or it was a very cheap "bargain" brand.


Here's why. The ballast circuit in the base produces some heat. It's not a
huge amount, but enough to make it very warm. It needs cooling, especially
in fixtures that have a reflector above the lamp to direct the light
downward, such as onto your desk. If it doesn't have enough holes at the top
part of the fixture to let lots of air pass around the lamp and the ballast
in its base, then out through the ventilation holes, you'll shorten the life
of the CFL.

I believe the life span of the CFL is related to price too. My "evidence" is
purely anecdotal, but strong enough that I avoid the cheap "bargain" CFLs.
I've been using GE CFLs for several years after some lower priced CFLs
failed after only a few months of service. I use all sizes from 40-watt
(equivalent) 'warm light' CFLs for reading lights to big ones equivalent to
100 watt 'daylight' (5800K) lights on the work bench. I haven't changed a
single CFL in years. The "100 watt" CFLs are in swing-arm fixtures with
cone-shaped reflectors that have a ring of holes around the switch at the
back of the socket that lets air pass by easily. Although the CFL itself
gets too hot to hold onto after extended use, the metal reflectors get just
slightly warm to the touch and I've experienced no failures yet.

I have also observed the RFI generated by both "bargain" and the GE bulbs.
There's a huge difference, at least with the bargain CFLs I've used. The RFI
from a bargain CFL anywhere in the shack would be plainly audible across at
least part of the HF spectrum, but I have to hook a wire to the rig antenna
jack and put it quite close to the GE CFLs to hear any noise at all.

I'm not making claims that the GE CFLs are superior to all others. It just
happens that after I had RFI issues with some cheap no-name units that also
failed quite early, I did a little research and went looking for a better
brand. The GEs happen to be the brand I picked up and I've had no need to
replace one since.

Ron AC7AC

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[Eric Swartz - WA6HHQ]

Interesting OT thread, but time to let it rest in the interest in
keeping list volume under control :-)
73, Eric  WA6HHQ

_..._



Jeremiah McCarthy wrote:
> The CFL that failed for me was a 22 watt GE, was made in China, and
> was not in a hooded desk lamp..
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