Shitty switching supplies are the cause of much home power EMI. There is no regulation of appliance emissions, and often the home wiring is a strong broadband radio transmitter for something as idiotic as a washing machine that is "off", or a cheap china battery charger left plugged in. Or a new fancy digitalized heat pump system, etc., etc. I think it's a foolish way to spend down your health. It was idiotic to wrap ourselves in the unshielded power cables of our homes, but that is what we've done.
FYI- Hackaday did a tear down on three LED bulbs.
https://hackaday.com/2019/02/05/what-happened-to-the-100000-hour-led-bulbs/The GE Basic and Classic bulbs have no switching supply, just bridge rectify the mains to an electrolytic capacitor, with a linear current regulator to the leds in series. The results of this design- fairly low EMI, just the emissions of the unsnubbed bridge diodes at 50ma of current. It could be a Lister flicker problem if your voltage dips too much on the compression stroke, but it's likely OK for SOM's or those with AVRs.
The Cree bulb they tore down has a crappy little switching power supply, so lots of EMI but likely no Lister Flicker.
An AM radio with loud static between stations is an effective ''poor man's near field sniffer'' for checking home power EMI. The AM band is in the range of typical switching EMI harmonics. If your home wiring is affecting much of the AM band, over 2 feet from the wires, you've got a serious problem that should be addressed. Common mode chokes or other suitable commercial passive filters are one cheap and simple fix, that go between the offending equipment and the outlet. Those without a digital meter can quickly isolate problems by listening to the AM radio at the main power panel as you switch breakers off. With a digital or smart meter, you can't do that as easily since the meter itself often has a laughably bad switching supply without any filtration at all; the power company doesn't have to meet any emissions specs, so dollar was saved.
Most computer switching supplies will at least meet conducted emissions standards, though that isn't saying much. Appliances aren't regulated for conducted emissions, so anything goes.