A dynamo is a timeless energy system that has provided power to bike lights for decades. Converting the forward momentum of the turning wheels into electrical energy provides constant illumination as long as you’re riding. The XLC LED dynamo headlight retro CL-D04 is a regulation-compliant LED beamer that borrows its aesthetics from days gone by. The single white LED throws out a bright 40 lux of luminosity, and the light includes a switch and sidelight to optimise its user-friendly safety features. This retro headlight is easy to attach to your city or trekking bike with its stainless steel mounting, and it also comes with a sensor, reflector and cable, as well as a removable cover (70 mm across).