[Tom] sent us a link to this extremely professionally done project. He developed a bike light that is a 540 lumen Luxeon light with a custom case. The LED, Lens, as well as driver were bought first. whatever else was designed around it. The style is compact as well as great looking. You can download the CAD data on the site if you want to make your own. He is utilizing an Atmel AVR ATTiny13 to manage brightness.