I have looked around, and as far as I can tell no one makes a bulb for headlights, something I've thought about doing was getting some of the luxeon LED's that are built with voltage regulator and a 1156 or other commen base for use on cars, get one of those, and then polish off some of the reflective coating on your headlight, clear epoxy it in, and wire it up as the driving light, of course this is more complecated if your driving lights are also your headlights, so find out if your head lights as driving lights get the full 12 volts or if they get less to alow them to be dimmer, if they are less, wireing in a switch that turns on the LED if it's lower voltage should do the trick.
__________________
|