These style LED's are mounted on either side of a metal bar so while they are extremeley bright and powerful they produce 2 x 170 degree beams oposite eache other like this:
Normal Bulbs create a 360 degree beam that reflects properly:
When that beam hist your reflector you get a reflection at the same angles so you do not get a true forward facing beam but insteal one in the air and one under your feet!
Interested to see your results though as I have tried many like it and not found a viable solution yet.
Hey Jaba, the ones I posted link of (H4, Hi/Low, for my Vespa) are having truly 2 x 180 deg, BUT, one off is for Low, the other is for Hi. meaning that upper LED sends light ONLY to the upper half of the sphere of the reflector. the other side's LED sends only to the lower half of reflector (Hi beam).
unfortunately, was not able to fit that one (general problem with Vespa GTS headlight, too cramped space between the headlight and the instrument). but managed to fit the other LED that I had from before, whose halves project left and right (same for both Hi and Low beams), as you described. That LED is more compact and just about fits in remaining space in front of the Vespa's instrument. BUT, that one has 4 off LEDs and does exactly you've described.
so, unless I sort out the cable problem on new one, I have to go back to halogen or do the HID conversion as some people have done, which means need to buy new headlight and experiment with splitting it