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  • How to Calculate Energy Savings of Incandescent Lights Vs. LED
  • 28-05-2012

 


LED (light-emitting diode) lights can save you significant amounts of money, while helping to save the environment. LED lights offer a zero-maintenance lighting alternative that provides equivalent illumination to incandescent bulbs, with environmentally safe components, at a lower wattage. LED lights also emit considerably less heat than their incandescent counterparts and last longer, which saves replacement costs and inconvenience.

Instructions

1
Estimate the average number of hours per day you have any particular bulb on.

2
Decide how many incandescent bulbs you will be replacing with LED lights. Also, note the wattages of the incandescent bulbs.

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3
Find out your cost per kilowatt-hour from your electric company. This figure should be on your electric bill, or you can call the electric company.

4
Calculate the daily cost of the incandescent bulbs using the following formula:

Cost(incandescent) = [(hours per bulb x number of bulbs x wattage per bulb) / 1,000] x Cost per kilowatt-hour

As an example, say you replaced eight, 60-watt bulbs, that are turned on eight hours per day, with electricity costs 12 cents per kilowatt-hour:

Cost(incandescent) = [(8 hours/bulb x 8 bulbs x 60 watts) / 1,000] x $.12/kw-hr

Cost(incandescent) = 3.84 kw-hr x $.12/kw-hr

Cost(incandescent) = $.46/day

To calculate the expense on a yearly basis, multiply that figure by 365, for a yearly cost of $167.90

5
Perform the same calculation as in Step 4, except use the LED light's equivalent wattage. For a 60 watt incandescent bulb, the LED wattage equivalent would be six watts:

Cost(LED) = [(hours per bulb x number of bulbs x wattage per bulb) / 1,000] x Cost per kilowatt-hour

Cost(LED) = [(8 hours/bulb x 8 bulbs x 6 watts) / 1,000] x $.12/kw-hr

Cost(LED) = 0.384 kw-hr x $.12/kw-hr

Cost(LED) = $.046/day

To calculate the expense on a yearly basis, multiply that figure by 365, such that the yearly cost is $16.79

6
Subtract the yearly cost of each bulb to calculate total yearly energy savings:

Yearly Savings = Yearly Cost(incandescent) - Yearly Cost(LED)

Yearly Savings = $167.90 - $16.79

Yearly Savings = $151.11


 

http://www.ehow.com/how_7456249_calculate-incandescent-lights-vs_-led.html

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