Freeplay Sherpa X-Ray
Price: £29.99 Bulb: Filament
Drivers who don't like buying batteries should seek out the Freeplay, as you can regenerate its power by winding (although it does have a mains adaptor for the lazy). A full charge should last around half an hour. To save energy, the bulb can be set to dim, but it is much more effective on full beam.