http://www.meritline.com/3-watt-led-...--p-30929.aspx
These are very sturdily built little AAA flashlights (outer metal is about 2mm) with a clip-mount that clamps onto handlebars. They've lasted me well over 3 years now. They're easily brighter than my old Planet Bike Halogen, and almost as bright as the Cygo-Lite that replaced it. I run two of them one my "second" bike, side-by-side, usually with one steady and one flashing. The biggest drawback as that the clip-off feature makes it too easy to grab one for use as a bright flashlight, at which point I tend to forget to put it back.