today's G word
Light-emitting Diode (LED) is a semi-conductor light source valuable as a long-lasting illumination technology. When a diode is forward biased (switched on), electrons are able to recombine with holes within the device, releasing energy in the form of photons. This effect is called electroluminescence and the color of the light, corresponding to the energy of the photon, is determined by the energy gap of the semiconductor.
These energy-efficient lights consume 80 percent less energy than conventional, incandescent bulbs. Common in digital clocks, remote controls, watches and appliances, they are now being produced in bulb form as a home lighting alternative.
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