Hi Well I'm back again with as usual more questions that answers! Ok I would like to build to following as an educational tool: The generator is MY1016 DC PM motor that can produce upto 200watts connected to a child's bicycle. Kids around 10 or 11 should be able to do a 40watts burst. The idea is this, a vertical row of low voltage incadencent or halogen bulbs, each around 10watts. As the child starts pedalling and produces <10w the first bulb is lit, then between >10w and <20w the second and first bulb are lit and so on. I like to have around 7 or 8 increments. Any ideas? Thanks for reading!