The way fireflies light up their lanterns has become an inspiration to increase the efficiency of LED. Researchers at the Pennsylvania State University (Penn State) found out that LEDs made with firefly-mimicking structures could improve lighting efficiency. Enhancing luminous efficiency of LED has been a research field for many scientists. Stuart (Shizhuo) Yin, professor of electrical engineering at Penn State, noted, "Overall commercial LED efficiency is currently only about 50 percent. One of the major concerns is how to improve the so-called light extra...