The "Edison" LED bulbs (also called "filament LED" bulbs) are thin strips of glass with lots of short wavelength LEDs mounted on the strip, with a coating of phosphor over all of it. The high energy light from the LEDs activates the phosphor, which then radiates the color determined by the phosphor. I don't know for sure, but I wouldn't be surprised if all the LED chips are wired in series, which might make it possible to run off 120 VAC without any power supply at all in the base. I think blue LEDs have enough slope in their I-V curve to handle any normal variation in the AC voltage. That would make them very quiet RFI-wise.
73, Dave AB7E On 11/26/2022 4:09 PM, jerry wrote:
There are also Edison-based LED bulbs specifically made to be RF-quiet for garage door openers. - Jerry, KF6VB
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