We think that modern hub dynamo light systems offer the best solution for lights for the bikes we sell. As long as the bike is moving the light is on. Modern LED lights offer heaps of illumination and visibility with very little resistance from the hub.
We stock lots of good quality battery powered commuting lights as well.
The Schmidt Son 28 and Son Deluxe are the best hub dynamos. Beautifully designed and made, extremely reliable and durable. The dynamo and axle bearing internals are protected with a labarynth seal system that offers 50,000km of riding between services. The Peter White Cycles site offers a great deal of technical information about Schmidt hubs.
Shimano offer a couple of good value dynamo hubs, if your budget won’t stretch to a Schmidt. Notably, they offer complete 700c dynamo wheels built around disc compatible Alfine hubs. These are the cheapest way to get a quality hub dynamo on your bike.