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Imagine having to put batteries into your lights every time you wanted to go out at night in your car,-and having them run out half way through a journey....
so it is for most cyclists in New Zealand...
Having permanently fixed internal hub-dynamo-powered halogen or LED lights with a capacitor to keep them going at intersections helps to make cycling much more convenient ( no worries about forgetting or fitting lights) , reliable ( no flat batteries) practicable (see in the dark) , and safe ( be seen ),
Internal hub-dynamo technologies have been perfected over the
years to provide reliable, silent battery-free electricity without
causing drag and they are a key feature in making cycling at night much
more convenient , reliable , safe and practicable for the majority of cyclists in the EU and Japan.
see:
http://urbanbicycles.googlepages.com/lightingtechnologies