22 Energy Cost Example 1 – 1000 Hours

Aaron Lee

For example, a 100 W incandescent lamp costs $1.20 to purchase and has an average lamp life of 1000 hours, while a 25 W LED lamp costs $30.00 and lasts 25,000 hours. If the cost of energy is $0.09 per kilowatt-hour, determine the electrical cost of running each load for 1000 hours.


Incandescent electrical cost:

LED electrical cost:

While the LED clearly costs less to run for 1000 hours, its high initial cost of $30.00 makes it the more expensive choice compared to the $1.20 initial cost for the incandescent lamp.


Incandescent total cost:

LED total cost:


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