The energy for this biker is provided by the sun, a big ball of nuclear fusion located over 91 million miles from Earth. This light hits the solar cells of the solar panel. There the light is converted directly into electricity, this spins the motor gear box and the biker is cycling. Designed for both indoor and outdoor use, the biker gets best performance under direct sunlight or under a strong halogen light. Since fluorescent light has a totally different light spectrum, it is unsuitable for solar-applications.