[vcf-midatlantic] OT: LED lights

Dan Roganti ragooman at gmail.com
Thu Mar 10 18:08:36 EST 2016

On Thu, Mar 10, 2016 at 2:30 PM, Dave McGuire via vcf-midatlantic <
vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:

> On 03/10/2016 01:20 PM, Dan Roganti via vcf-midatlantic wrote:
> > ​From what I've seen
> > only the 'dimmable' LED bulbs have RF pollution, not plain LED bulbs
> > ​Dimmers in general create this problem too, even with incandescents.
> > ​So even if you buy plain LED bulbs and your room is wired with a dimmer,
> > You still have a problem - even thought the LED bulbs will not dim.
>   The non-dimmable ones still use high-frequency transformerless power
> supplies.  I've not measured one myself, but I'd be shocked if they
> didn't radiate quite a bit of EMI/RFI as well.  Are you certain of this?
​oh yea, nothing has zero percent emissions.
I checked my plain LED bulb again and it only happens if I put it right up
against the radio.
And again the radiated energy is minuscule.
​But the dimmable LED bulbs have several orders in magnitude of energy.
They are very distinguishable from a distance.
So much so, you wonder why they don't require a FCC part 15 class B
Besides, any home micro over there built before the 1979 FCC reg's would
very likely not pass this either.
So you can still have a problem.

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