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CFL light bulb efficiency. Animation showing the energy efficiency of a CFL (compact fluorescent lamp) light bulb. 60% of the electrical energy of this 30 watt light bulb is converted into light, producing 1600 lumens of illumination. 12 watts are lost as heat. The energy efficiency of CFL light bulbs is several times better than incandescent lamps, but not as great as LED (light-emitting diode) lamps. See K004 8880 and K004 8875 for comparison.

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