[Elecraft] Noise from LEDs

[David Anderson]

I was just thinking that I had removed all of the CFL bulbs from my house, because I hate them, their horrid colour, their slow start up and that they do not last and smoke. Then tonight my wife called me to say that the hall light had stopped working, the last CFL in the house. No smoke, just dead. It has hardly been used in the years we have had it.

I have replaced all my CFLs with Halogen clear bulbs (40 watts) which we can still get through some loophole, at least for now. I care not that they produce some heat as well as light, as it warms the house up who we have the lights on in the winter. I am stockpiling them.

 I have LEDs in the bathroom that don't appear to cause any noise, ironically the 12 V halogen ones before did because of the SMPSU that they used. 

I also have a Phillips LED lamp bulb in a table lamp that is totally RF quiet.

73 from David GM4JJJ

> On 2 Feb 2016, at 17:44, 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
> 
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