Pedal-powered generator light systems, made in Denmark by Reelight - $59.99 to $99.99 

"A fantastic addition to any commuting bike. Incredibly reliable, always on, never out of batteries"

• Award-winning technology from Reelight in Denmark
• Breakthrough generator system uses magnets for power, NOT rims or hubs
• Light bracket attaches to the wheel axle, and magnets attach to spokes
• Motion of wheels create power for ultra-bright LED bulbs
• Lights automatically turn on when you start pedalling
• No batteries, no resistance, no noise
• Some models keep lights on when bike is stopped
• Light, easy-to-install and very reasonably priced
• Fits most bicycles