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Adequate for casual night riding, and good as a stand-alone flashlight
on September 19, 2011
This light can illuminate an oval roughly 7 feet wide by 20 feet long when aimed about 8 feet in front of a bike. I find that useful for typical bike speeds to avoid flats, but don't expect much detail beyond 50 feet (if you angle it up more). I don't think it's safe to ride with this light much faster than 12 MPH in pitch dark conditions. The flashing mode may cause headaches if left on too long, but it will get people's attention.
Comparing it to a high-tech flashlight with variable brightness, it seems to produce maybe 20 lumens (subjective). That may not seem like much, but the light is focused effectively for bicycle use. There is a dark ring and halo surrounding the center beam and enough side-scatter so you don't get tunnel-vision.
The light weight of the body gives the feel of something that won't pitch up or down on its mount. It uses a typical clamp and rubber band spacers. There is a slide-forward clip so you can remove it in seconds if you want to sweep an area. Because of the impressive battery life, I can see buying one as a good "cheap" household light, even if you lack a bike.