Haha, yes. I forgot the name. I estimate it can be 10-20% extra pedal power required to overcome the extra friction when the dynamo is flipped into active mode

Haha, yes. I forgot the name. I estimate it can be 10-20% extra pedal power required to overcome the extra friction when the dynamo is flipped into active mode. Sucks. Grocery stores sell the little led clip on lights, so most people done use the dynamos.