I have no idea. Its not like there is a shop you can walk into with ebike products on the shelf. Its very expensive here in Australia generally . Theres only 2 ebike shops anywhere near me. One has very little on their walls(on display) and the other is the same. I didnt even know one had the same light because i took it for granted they only had the minimal stock on the walls and nothing in the back room or wherever. Anyway will tackle this again in a few days because i think theres one other reason the light may not be working. Could be the push button on/off switch. No time to check for days though