4 Ways We Make Light   The Lighting reSource   June 2016

When early humans built the first primitive fires, they gained warmth for cold nights and a way to cook meats and vegetables. But they also gained light, which allowed them to navigate and complete tasks after dark. Millions of years later, we still gather around fires for warmth and comfort. But while we continue to turn to fire for light, we also have artificial light sources that
help make our lives easier, in many ways, than it was for our ancestors.

How Light Emitting Diodes Work

by Tom Harris & Wesley Fenlon         Tech | Solid State Electronics

Light emitting diodes, commonly called LEDs, are real unsung heroes in the electronics world. They do dozens of different jobs and are found in all kinds of devices. Among other things, they form numbers on digital clocks, transmit information from remote controls, light up watches and tell you when your appliances are turned on. Collected together, they can form images on a jumbo television screen or illuminate a traffic light.