"micky" wrote in message
...
In alt.home.repair, on Mon, 3 Jun 2019 06:15:07 -0400, Biff Tannen
wrote:

On 6/2/19 9:18 AM, micky wrote:
I've been listening to a weak FM radio station, on a radio, and 2 feet
away was a desk lamp. It used a CFL and I noticed static or some kind
of interference in the reception. It could be lessened by changing the
frequency a little, but the result was still less volume than when the
light was off.

So I figured, LEDs! They won't make interference. Bought Ecosmart.
Then the radio hummed so loud I couldn't hear the station at all.

I will probably go back to incandescent. Any other way to get rid of
the hum?


Probably expensive but if the lievertising is to be believed, these might
fix your problem.

https://www.geniecompany.com/garage-...ight-bulb.aspx

It's $19/2 of them, at Home Depot and Amazon, and Amazon has one for
almost $10. Thanks. Expensive but a good idea.

Bob, there's one other bulb in the package. I'll try that

As I said, with the CFL the interference could be lessened
by turing the radio off frequency a little**,

That's because it was a relatively weak harmonic of the chopping frequency.

but with the first LED bulb, I turned the tuning knob a half turn in each
direction, from maybe 88 to 92 MHz FM. and the hum was the same
everywhere, twice as loud as the sound had been.

That's because the designer was stupid enough to
use a chopping frequency that's right in that band.

It's interesting that it interfered with FM reception, which is
less vulnerable than AM, but it appeears, not invulnerable.

Yeah, particularly with that powerful a signal.

**An advantage to analog tuning over digital tuning.