[Elecraft] Noise from LEDs

[Robert Nobis]

Ron,

I have had two CFL’s fail that were well beyond a “puff of smoke”. Both were actually melted and charred black. They were from two different manufacturers. I also have had CFL’s simply quit after a few years, and the base of them was brown from overheating.

That is part of the reason why I converted all bulbs in my house to LED.

73

Bob Nobis - N7RJN
n7rjn at nobis.net


> On Feb 2, 2016, at 10:44, Ron D'Eau Claire <ron at cobi.biz> wrote:
> 
> That sounds like the CFL failed as it was designed to fail.
> 
> CFLs draw more current as they age. Eventually the power supply is
> overwhelmed by the current demand and fails. All the CFLs I've seen use a
> tiny (1/8 or 1/16 watt) resistor as a fuse. Before anything else gets
> overloaded enough to fail, the little resistor acts as a fuse and opens.
> But, being a resistor, it fails like a resistor often with some smell and
> brief puff of smoke. I suppose it might be possible for a flame as the
> covering burns, but that should be inside the base enclosure. I've never
> seen anything but a small puff of smoke if I am looking in that direction
> when it goes. 
> 
> 73, Ron AC7AC
> 
> 
> 
> -----Original Message-----
> ... a couple of those so called "5000 hour" Chinese CFL's actually burned up
> (yes, smoke, fire and flames) 
> 
> Jim - W0EB
> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to n7rjn at nobis.net
>