[Elecraft] LED Lamps and HF RFI?

[David Bunte]

Ted -

I have a LOT of CFL in my house, but have been leery about LED  bulbs,
because of concerns about RFI.  about 3 weeks ago I saw a single BR30 size
LED bulk on a "bargain"  table at the supermarket. (I was looking for
cookies).  It was only $3.00 so I gave it a try.  I put it just outside my
shack, so it was easy to turn it on and off while listening for noise.  I
checked 160 - 10 meters and detected NO change in my K3.  A few days ago I
found two-part of similar bulbs under the GE name.  I put them in the next
nearest can lights, and can hear no increase in noise between the on or off
positions.  That may not be very scientific, but I am happy.

Next I want to see how well they behave with a dimmer.

Dave - K9FN
 On May 11, 2015 10:14 PM, "Dauer, Edward" <edauer at law.du.edu> wrote:

> Had an electrician at the operating QTH today to discuss replacing the
> recessed ³can² lighting throughout the house.  He suggested replacing the
> incandescent cans (now 65 watts per bulb) with LED lamps (same lumens with
> 10-13 watts per bulb).  I have looked at the Internet on the question of
> RFI from LED bulbs and see wildly inconsistent reports.  It is the case
> that HF radios like the K3 have LEDs in their panels; but I would be
> installing as many as 60 LED fixtures running at 10-13 watts each.  My
> caution comes from my novice days in the 50s when a single fluorescent
> lamp put my hamming out of business - things were quiet when the only
> light source was the filament of a 6146 and the dial lamps on the HQ-100.
> I know that LEDs aren¹t at all the same; but I don¹t want to relamp the
> house if it puts me off the air.  And if they (or their power supplies) do
> generate RFI in the HF bands, would the K3¹s NR get rid of it?  Anyone
> have any good data on this?
>
> Tnx,
>
> Ted, KN1CBR
>
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