use on a road bike. Almost 4 months at the time of control. 3000km so far. I turn it on at dusk or when crossing lanes. 3 stars for brightness because they are advertised at 12000 lumen output. I have had similar 8000L lumen flashlights that were brighter than this one. They are bright and do what I wanted them to do. Side throw feature because I live in a country where there are no street lights for over 20 miles and I need to check the roadsides for critters. They are aimed low so as not to illuminate oncoming traffic or people in front of me. I haven't "flashed" any other drivers yet. People who drive with care usually shift to the right when I'm approaching from behind. Overall I like them and work for what I wanted them for.
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