headlight for MTB

[ticklechicken]

With the days getting shorter, I'm not able to get in some trail riding after work. I need a light. I ride tight trails with a lot of steep drops and jumps. I would like to have lights on both my handlebars and my helmet.

Anyone have any suggestions? I've done some initial reading, and anything decent seems to be over $300. Can I make my own for cheaper? Maybe using some of the Hobbyking LiFePO4 packs?