Looking to upgrade your bikes headlight output? This is your chance. Replace the round conventional headlight bulb with this This halogen headlight bulb. This is an H4 bulb that is mounted in a P45 base at the factory ( p45 mounting is a round base with a location peg for positioning, that you have on your BMW now) ,The bulb is for 12 volt system with a , 60/55W high and low beam. This item was developed by mistake of the manufacturer. The results of testing the bulb in the headlight were amazing! This bulb has higher lumen output than the standard bulb for your BMW bike. Don't watch this listing , get the bulb and ride your bike .