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Re: [RFI] Cree LED Light Bulb

To: "rfi@contesting.com Reflector" <rfi@contesting.com>
Subject: Re: [RFI] Cree LED Light Bulb
From: "Dale J." <dj2001x@comcast.net>
Date: Mon, 11 Aug 2014 15:38:43 -0500
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
I've had several modern day CFL's fail.  Just the other day one in the basement 
which is on 24/7 went out.  I thought I had a bad socket as I unscrewed the 
light and back in again, it started up on for a few seconds but then went out.  
I changed out the CFL with another CFL, same size and it's still working.  The 
CFL's that have failed have signs of overheating even though I have them in 
well vented fixtures.  A couple of the failed CFL's developed loose glass, but 
weren't cracked just loose.  I also dissected one too, curious what's inside.  
I found an IC, some resistors and capacitors mounted on a PWB.  I have not 
noticed any RF noise from any CFL and we have quite a few around the house.  I 
must say it takes a couple years for them to fail and several are on all the 
time.  I have two in the shack in Luxo bench lamps, well vented at the top.  
They are inexpensive and I'll continue to use CFL's until something better 
comes along for about the same cost.  

If I recall, the mfg of one brand of CFL stated that they should be used in an 
upright configuration, I take it to mean the heat will rise away from the 
electronic pod below the glass. Maybe makes sense, but in my use most of the 
CFL's are upside down so any heat generated from the glass will go into and 
around the electronic pod base, perhaps shortening it's life, just a guess.  

Dale, k9vuj

On 11, Aug 2014, at 13:38, Jim Brown <jim@audiosystemsgroup.com> wrote:

> On 8/11/2014 11:05 AM, Charlie Gallo wrote:
>> Again,  you're  looking  at  1.17  watts of light, and therefore 12.83
>> watts as heat
> All good analysis, quite sufficient as far as fire hazard is concerned. But 
> there's another issue -- that 13W of heat has to go somewhere, and depending 
> on the enclosure, some or all may stay within the enclosure and raises its 
> ambient. That may, or may not, allow sufficient conduction of heat away from 
> the circuitry to prevent destructive failure of the lamp and/or its circuitry.
> Something like 5-6 years ago, I bought a couple of Edison-base multi-LED lamp 
> assemblies from a hamfest vendor, and stuck them in a simple reflector 
> fixture (one-third spherical, thus 2/3 open) as lighting in the shack. Within 
> a month or two, both lamp assemblies had developed cracks in the glass.
> 73, Jim K9YC
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