Occasionally, during events or construction, you may see temporary stop lights set up by workers. How do these portable traffic signals work?

They’re in your phone, TV, car headlights, remote controls—even traffic lights. LEDs (Light Emitting Diodes) are everywhere. But how do these tiny components turn electricity into light? In this video ...

First of all, yes I read the FAQ. There are 2 LED articles, but they didn't answer my stupid n00bie question. Second, yes I did a search, but I didn't find what I was looking for. <P>My stupid ...