You can get a complete dynamo wheel plus bright headlamp that never needs batteries or bulbs for about $150 these days. A wired taillight only a bit more…. Though these systems are all nominally 3W, the older halogen types produce palpably more drag than the newer, brighter, longer-lasting LED types.
LED dynamo headlamps brighter and less draggy than halogen
Posted on December 10, 2010.