Good, all shoving the wrong bulb in a wrong reflector does is dazzle other road users. Yeah they are brighter but the focus/aim is usually dangerous.

For bikes using traditional round lamps you can get proper LED headlights fairly cheaply now. They would pass as the entire unit is designed for LED. Most have the LED's built in to the unit though, this puts me off as if it goes pop, you can't just easily swap out a new bulb.