It's d1s hid headlight bi-xenon bulbs(not fit any halogen bulbs). 1.5X brightness up 6K D1S xenon bulbs upgrade for 2006-2016 BMW 528i 535i 550i 535d 535xi 528xi 528 535 550 i xi gt projector hid headlights bi-xenon low beam (note: never fit any original halogen bulbs like 55W H7 etc.).
