[Milsurplus] LED Lighting and EMI

[Joe Montano]

I have quite a few LED replacements in the house and I have not heard any RFI anywhere between 3 and 30MHz.  Yes, they were about $10 each, but I feel they are definitely worth every penny.

Sent from my Verizon Wireless 4G LTE DROID

"J. Forster" <jfor at quikus.com> wrote:

>A friend asks:
>
>My biggest question about LED lighting is how much radio interference it
>generates at frequencies up to about 30 MHz (HF).  Other users of the
>radio spectrum are more concerned by interference at higher frequencies,
>through VHF and UHF.
>
>AFAIK, an LED by itself does not generate radio interference; it is the
>electronics between the LEDs and the AC power line that concerns me.
>
>Fluorescent lights (both CFLs and long straight tubes) with electronic
>ballasts are bad because an electronic ballast switches AC line power with
>very short rise & fall times, so the ballast strongly excites the line
>with radio-frequency power at whole-number multiples of the switching
>frequency up to 30 MHz and beyond.
>
>It is possible to reduce this radio “noise” or interference to a tolerable
>level by means of shields, L-C filters, and ferrite chokes; but very few
>manufacturers of fluorescent lighting products do.  If they do anything,
>it is nowhere near enough.
>
>I’m waiting for the prices of LED-lighting products to drop further before
>I buy some for evaluation.  Meanwhile, can anyone direct us to published,
>quantitative information about the radio noise generated by LED lighting
>products?
>
>
>Best,
>
>-John
>
>===============
>
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