A halogen bulb is just a bulb that sends light in all directions, except straight forward, and depends on the reflectors in the headlight housing to direct the light, right?
I'm sensitive to being that guy that just sticks a high output HID bulb in without a projector to focus, which is why I haven't gone that route. Since the LED is putting out light in a similar pattern as the halogen, I'm less worried about blinding others.