Excellent! Works great on my Ebike. The voltage of this lights is up to 80v. I am running 18s battery so 75v fully charged and I can connect directly to the battery and just add the on/off switch.
Came quickly. Not very bright compared to other lights. Casing good although not able to open it for light bulb replacement. (no screws) Also it seems it has loose parts in it when you shake/move it. which makes it noisy when riding.