I recently tried an LED H4 replacement "Bulb." An "RTD" Motorcycle Headlight for Yamaha, Kawasaki ect.
It came from China to the mailbox for $25. I had considered the complete LED headlights a few years ago but they were expensive and I was not sure they would work properly with the automatic switch box for a burned
out H4 headlight filament. Thought it might try to switch back and forth thinking a filament was burned out.
This "RTD" device fit right into the Vetter Shell, was a direct replacement for the H4 Bulb.
Pros, It is very bright. Less current drain lets other bulbs like instruments shine brighter.
Cons, The big copper colored thing/"Bulb" is easily seen in the center of Your headlight.
Almost all of the light comes out of the top half of the reflector/shell.(needs a custom reflector)
There is a slight flicker at low RPM, probably the rotor magnet passing the stator coil makes a surge.
It is obviously not a standard bulb, anyone can see that. It does not say DOT on it that I can find.
Will probably go ahead and get a full headlight assembly like the "Trucker" now after seeing the LED worked.
Not sure what the LED Headlights will do on failure, company reps a few years ago indicated there was no
automatic switching to a spare light or filament on failure of an LED Headlight.