Switch it up: How LED lights can save you big time Sometimes, saving the world starts just one light bulb at a time. LED stands for “light emitting diode”, which is just science speak for the way the bulb converts electricity into light -- which, by the way, is super efficient. In fact, according to the Department of Energy, LED bulbs use 75% less energy than your traditional incandescent lighting and emit almost no heat rays. But that’s not all. They also last 25 times longer than regular bulbs and have the greatest potential impact on energy savings in the...