I have retrofit projectors with halogen h7 bulb. But i dont want to HID cause most time i drive in city. So best choise is LED i think. Those popular LED with diodes on both sides have one similar problem: black slot in front of headlight on road. It you can see it in screenshot. By searching about LED in projectors i have found that LED form makes big difference of light output in different xenon projectors with 2.5 and 3 inches. There is url to that comparison
https://www.led-car-light-manufactur...eadlight-bulb/. Now iam planing to wisit local shop with cheap LED and try it out variuos options and find out does it realy makes sense.