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CFL Savings Estimator

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Assuming you replaced all your incandescent bulbs with compact

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fluorescent bulbs, how long would it take to recoup the costs?

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$0.0698$ / kWh

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5Average hours per day of 60 Watt bulb use

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5Average hours per day of 100 Watt bulb use

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Bulbs60/14 Watt100/23 WattTotal

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Number of bulbs12618

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Incandescent

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Cost per day per bulb$0.02$0.03--

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Cost per day bulb$0.25$0.21$0.46

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CFL

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Price per bulb$1.72$3.44--

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Total rollout cost$20.64$20.64$41.28

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Cost per day per bulb$0.00$0.01--

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Total Cost per day$0.06$0.05$0.11

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Savings Per Day$0.19$0.16$0.35

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Savings Per Month$5.78$4.84$10.62

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Days to recoup costs107.14128.01116.65

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Months to recoup costs3.89

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Money saved in following year$129.17

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Assumptions:You already have the incandescent bulbs

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No incandescent bulbs would have burned out during the cost recoup period

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None of the CFLs burn out during the recoup period

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A 14 Watt CFL will produce an equivalent amount of light as a 60 Watt incandescent

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A 23 Watt CFL will produce an equivalent amount of light as a 100 Watt incandescent

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All bulbs are the same type. In reality there are various styles (size and shape) and light type (soft white, bright white, daylight) which all cost different amounts.

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You can buy exactly how many bulbs you need without buying extras

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The 'money saved in following year' line assumes that no bulbs die within that year following the cost recoup time

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Bulbs:The n:vision bulbs at Home Depot were the cheapest I could find, and they were cheaper in store than they were online.

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A four pack of 14 Watt Soft Whites was $6.88

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http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&langId=-1&catalogId=10053&productId=100527355&N=10000003+90401

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A two pack of 23 Watt Soft Whites was also $6.88

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http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&langId=-1&catalogId=10053&productId=100527342&N=10000003+90401