Caution what you use if on
Somewhat unfair to give it only one star since it is well made, appears to be quite bright, and not too difficult to mount if you have a front rack. My plan was to replace my stock light from my Radwagon with this, since the Rad controller has the ability to switch the light on and off. After mounting and wiring I tried to turn it on but it would only flash once for a second and turn off. I measured the voltage at 53V. Thinking the light might be defective I took it back into the house and tried to power it with the next largest source of DC power, my laptop charger at 19.5V. The light worked fine and was bright even at the lower voltage. My assumption is that the light is drawing too much current and the controller is shutting it down. Bummer, it really looks great.