Essay
A 9 W LED lamp produces light at an intensity comparable to a 60 W incandescent bulb. If the lifetime of the bulb is 30,000 hours and electricity costs per , what is the total savings in energy costs over the life of the LED?
(b) If the LED is used an average of 5 hours per day, how long will it take to realize these savings? What is the average savings per day?
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