If more energy efficient light bulbs use 20% less energy than conventional light bulbs, then how do they work? Is it still true that heat emits light? - Quora
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250R40/1 250-Watt, Incandescent R40 Reflector, Clear Head Lamp, Heat Flood Lamp Light Bulb, E26 Standard Medium Screw Base, 120V, 6,000 Hour Rated (Pack of 2-Clear-Heat Lamps) - Amazon.com
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