A volunteer is asked to produce electrical energy on an exercise-bike to illuminate two different types of lamp. If he is pedalling with all his strength, he can drive a maximum of 4 to 6 halogen bulbs. If the bike is switched over to the bar with LED lights, it is relatively easy to make all 20 LEDs of the same brightness shine brightly into the audience.
How does it work?
In an incandescent lamp, a large proportion of its energy is lost as heat. With LEDs, the proportion of energy converted to light is much greater. Therefore, with the same power input about 5 times more LED lamps than incandescent lamps can be lit.
