I use an adblocker, don't think I've ever seen an ad on YT. Personally, I prefer a written out procedure with pictures as needed, but no one seems to be doing that anymore so you're more or less stuck with a video. Some are OK and helpful, others not so much. I do wish they'd cool it with the background music, it adds nothing and can be quite annoying.
Yeah, discovered the same thing with my old JD 750. I noticed one of the headlights is broken on my Kioti...I've got aux lights on the FEL arms so I'll just sleaze by for the winter but come warmer weather I'll probably swap out both headlights for LEDs.
I mounted aftermarket lights on my FEL arms...ROPS has a couple amber strobes I use when I'm working on/near the road.
LEDs shouldn't present any electrical issues...they don't use very much power. Always a good idea to fuse them and make sure the wiring is routed so it doesn't chafe or pinch.