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What is an LED Light Bulb? LED's are very similar to traditional light bulbs, except that they fit directly into an electrical circuit. LED's do not have a filament, so they generally last for a long, long time without burning out. Because there is no filament, LED's do not get hot and require far less electric power than traditional light bulbs due to their efficiency. In fact, LEDs are illuminated by electrons that run through the semiconductor material that LEDs are connected to.