I (Andy) was introduced to Fenix lights during the 2010 Abu Dhabi Adventure Challenge. I was super impressed - the light i used, the HD20 - was an ultralight package powered by a single lithium battery. The team also had a pair of their flashlights that were unbelievably bright for their size and weight. Team Yogaslackers will be using Fenix lights for the 2011 racing season because they rock. Happily, Fenix has agreed to sign on as a ENDracing sponsor and will be supporting our races! You can find their products online (AMAZON), so you've got no more excuses for not practicing your night nav! The next 24 hour race will be here before you know it!