How much heat comes from a light bulb?
by 
The Curious Bag
ANSWERS: 1
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Regular incandescent light bulbs give off about 90 percent of their wattage as heat. For example, a 60-watt incandescent bulb gives off about 54 watts of heat, with the remaining wattage producing the light. An equivalent fluorescent bulb only emits about a third as much heat.
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