Almost every LED light I've tested (hold an AM or shortwave radio antenna nearby) emits RFI or EMI across a vast frequency range. The EM noise comes either from the base of the bulb, or from some box or wall-wart supplying a DC voltage to the LED fixture.
Is there any common solution to fixing or reducing this EMI? Other than throwing all these LEDs away and going back to hot incandescents? (which may or may not be legal in some settings.). Putting a opaque Faraday case around a light bulb makes them useless for lighting.
Maybe some sort of filter boxes on the AC wiring, or the DC wiring if accessible? A box of ferrite cores?
Does there exist any certified power efficient low EMI lighting? (e.g. more than just generic required regulatory labels on the boxes which may or may not indicate anything about what's actually in the box).