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Velocio
edscoble
While SONs were the go-to for years, LEDs have changed the formula. A number of new generation dynamos are making the choice more difficult. One of the coolest, I think, is the Velogical: tiny, rim powered, weighing only 75g and 70% efficient. Some long distance riders are combining these with strorage/USB chargers--- running their lights off the batteries being charged by the dynamo rather than directly powered. A popular open source/community DIY project is the German Forumslader: http://www.forumsloader.org (unfortunately only in German). The Velogical runs 150 EURO--- they even make a variant optimized for something like the Forumslader instead of lights--- and the cost to built a Forumslader will probably be between 70 and 150 Euro (using one of the kits). For standard Audaxing a lot of overkill but for....