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Incandescent An incandescent light bulb works by heating a wire filament heated to a high temperature by passing an electric current through it, until the filament glows with visible light. This means that the bulb is primarily powered by heat, rather than actually creating light. In fact, as the bulb continues to operate, the filament slowly evaporates due to the heat, until it eventually breaks down completely and the bulb needs to be replaced.  CFL A compact fluorescent light …