Free LEDs

[Mike Watterson]

I tried them with a 12V elecronic halogen driver but barely worked. I think most if not all halogen drivers output AC. Haven't yet put a scope on one to check.

I have a bunch of SMPSU halogen drivers from 1990s. They only have rectifiers on the input. I'd guess the frequency is between 16 kHz and 40 kHz, but I've not checked.
There has been a complaint that BS, CE, FCC and CSA RFI generation testing of separate PSUs for LEDs and halogens is unrealistic as it doesn't include typical real world wiring between the PSU and the luminaire.
Similarly there are issues with so called ethernet over mains adapters. The slower ones wipe out SW and faster ones radiate to about 120 MHz.