I bought this to use as an ebike rear light. I'll probably change it so that it doesn't focus into the beam as it's blindingly bright when aimed at you. I ran it on a battery charged to 58.8 volts, which as I said draws 20-30 watts. I like that it can be used over a wide voltage range. It can run on a 9V battery, but will begin to dim if operated below its rated voltage or if operated from a battery with insufficient amperage.
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