I just got some H4 LED replacements. Vastly better than the standard bulbs and less current drain too but not up to modern all singing, all dancing purpose built LED standards.
I don't think these pass MOT tests (yearly mandated inspections to avoid having dangerous vehicles on the road - in theory) in the UK - the LED bulbs dont play nicely with the beam pattern forming. I gave up on that idea.
The aftermarket LED headlights are all for LHD or RHD, not both (or neither - vut these motorbike units, that seem acceptable in the US, fail beam pattern tests in the UK).