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10. The efficiency of a an energy process is Useful power output Power Input Estimate the efficiency of a "traditional" 60 watt incandescent bulb (the kind invented by Thomas Edison in 1879 and until very recently the most common bulb used in household applications). A 60 watt incandescent produces 800 lumens (a measure of visible light output). To convert watts to lumens, use the conversion 1 watt = 683 lumens (interestingly this conversion depends on how the human eye perceives light). Note: When you buy a light bulb, the package will include a lumen rating, but it may also include a rating such as "60 watt equivalent" meaning the bulb has a light output equivalent to a traditional 60 watt bulb, even though the bulb will draw much less power than 60 watts. 10 .... MacBook Air 20 686 DII DD F3 F4 F5 F6 F7 F8 F9 F10 F11 $ % & 4 5 6 8 9 O R T Y U O P F G H C K