This instructable describes how to integrate LEDs with fischertechnik elements! My original vision was to create a mechanical video game that would light up LEDs. Then I started tinkering with fischertechnik's Eco Power kit (#57485) and realized that my first step would be a simple explaination of how to use LEDs with fischertechnik models. I play with different educational manipulatives for a living. (Visit www.weirdrichard.com and www.edventures.com). Over the years I have built different models using all sorts of toys, and I have created many different electronic based devices that use LEDs.

http://www.instructables.com/id/Integrating-LEDs-with-fischertechnik/