On 03/10/2016 06:08 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.
Of course. But most anything will have more than an incandescent bulb.
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.
My EMI pre-compliance test setup is nearly ready to roll. I should get some representative LED bulbs and put them in the test chamber to see what their emissions profiles look like.
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.
I think a great many Chinese companies are skirting past the FCC regulations. -Dave -- Dave McGuire, AK4HZ New Kensington, PA