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Light Bulbs have changed a lot during the last centuries. 1879: Incandescent bulbs create light by heating a wire filament until it glows. But they waste 90–95% of their energy as heat. 1970: Compact Fluorescent Lamps (CFLs) changed the game. They excite gas inside a tube, which emits ultraviolet light that a coating turns into visible light. They use about 70% less energy than incandescents and last 8–10 times longer. 2000: Then came the Light Emitting Diode (LED) revolution. LEDs produce light
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