thats parklight or auxilliary light.
buy a super bright high power LED LIGHT peanut bulb.
there are available that is 1watts, 5 watts, 10 watts LED light
i use led light on park light, it may not be the same as headlight
but at least if my headlight broke down, i can still drive the bike at night slowly using that parklight...
or
change it to projector light see my forsale section...