The only time I've noticed RFI issues from CFL or LED bulbs is when they
are being excited by RF. I've measured 3 or 4 different ones of
different brands and wattage ratings. This was done using a fixture
where by the bulb was mounted on a suitable surface in a socket with the
transmit antenna {dual band VHF/UHF} some 6 ft away from the lamp and
the receive antenna {connected to a spectrum analyzer with a similar
dual band VHF/UHF antenna}, about 6 ft from the lamp. In all cases no
noise above background noise was observed. When the transmitter was
activated, the spikes of noise appeared. With the transmitter off, the
spikes again were not present. Not a real analytical or scientific
method but some degree of indication that some are better than others,
some are worse than others.
73
Bob, K4TAX
K3S s/n 10163
On 10/24/2017 7:45 AM, Charlie T wrote:
I must have at least 30 LED bulbs around the house ranging from ½W to 23W (eq.
to 120W incandescent flood light).
Most are in the range of 25 to 60 Watt equivalent (200 to 800 Lumens).
Some are 5 years or more old and are from many different manufacturers.
The distance to antennas is anywhere from 12 feet to 150 feet.
Admittedly, I have never actively gone so far as to turn off each one
individually, but I don’t seem to notice any extra RFI anywhere.
There ARE a couple dimmers that raise holy heyull, but I make sure those are
off when operating.
That said, it may be an eye-opener for me to have my wife selectively switch
the LED's on/off while I listen to the bands.
73, Charlie k3ICH
As a side note (to an already off topic thread), I bought a couple timer
switches that do NOT use dimmer type (= NOISY) switching.
They are Intermatic, "Heavy Duty Timer", model ST01K, about $30 at Home Depot.
They use a latching relay and are battery powered (CR-123) which is supposedly
good for about three years.
They have their own clock/timer that runs regardless if the AC is on or off,
and also takes into account daylight savings time.
They replace regular wall switches and I use them to control the living room
lights and circulating fans in the winter for the wood burner in the basement.
They can be programed for four different modes with two variables, Time on/time
off, and/or Dusk on/Dusk off.
The living room lights are set for dusk ON, and 2300 OFF.
That way I don't have to monkey with a mechanical timer, resetting as sunset
varies or we lose the juice in a storm.
The fan control is set to come on at 0630 and go off at 2330.
During the summer, the fan switch is in its manual mode (OFF), because they're
only needed in the winter.
Another nice feature is an override button which when punched will change the
state of the powered device.
They're somewhat of a bear to program, but they DO exactly what they're
supposed to AND, except for the initial ON or OFF switching, make absolutely NO
RF noise.
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