How Everything Works
How Everything Works How Everything Works
 

QUESTIONS AND ANSWERS
 
Question 496

What is the efficiency of a 60-watt bulb to convert electricity to light?
Since only about 80% of the heat a 60-watt bulb releases is thermal radiation and only about 12% of that thermal radiation is visible light, the bulb emits about 6 watts of visible light. A halogen bulb is a little more efficient than this and a long-life bulb is a little less efficient than this.
         

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