MJ-900 bike light has 1200 theoretical lumens, using a Cree XM-L2 LED. This little light really is tiny, but does pack a punch for it’s size. We’ve kept everything as small as possible including the battery especially for the road boys where weight is paramount. The MJ-900 comes with a 2.6Ah 7.4V battery as standard weighing in at 130 grams it will make your commute a synch with very little extra weight to carry!