The Sylvania Super Saver 75-W light uses 20 watts, produces 1280 lumens, and costs $4.49. As an alternative, a generic 75-W-incandescent light bulb costs $0.40, produces 1200 lumens, and has a service life of 750 hours. Compare the performance of each light by calculating the efficacy for each light and estimate how much it would cost to run each light for 4 hours per day for 300 days in a year. Assume electricity costs 9 cents per kWh.
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