How to calculate energy savings of incandescent lights vs. led

Written by c. taylor
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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.

Skill level:
Moderate

Instructions

1. 1

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

2. 2

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

3. 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. 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 £109.1

5. 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 £10.90

6. 6

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

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

Yearly Savings = £109.1 - £10.90

Yearly Savings = £98.2

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