MLA Citation: Bloomfield, Louis A. "Question 496"
How Everything Works 19 Mar 2018. 19 Mar 2018 <>.
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.

Return to
Generated for printing on Monday, March 19, 2018 at 8:50:44 EDT
Copyright 1997-2018 © Louis A. Bloomfield, All Rights Reserved
Privacy Policy