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WUEG March 2015 Newsletter

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CFL - an Amazing Investment<br />

Josh Haghani – Senior members, Academic Committee<br />

By replacing incandescent light bulbs with<br />

compact fluorescent lights (CFLs), a 476% taxfree<br />

annual return can be achieved. The EIA<br />

estimated that in 2012, 461 billion kWh were<br />

used to light both U.S. residential and<br />

commercial sectors. Lights amounted to 17%<br />

of total electricity consumption for the<br />

residential and commercial sectors, and an<br />

amazing 12% of total U.S. electricity<br />

consumption. A typical incandescent light bulb<br />

produces 1,600 lumens using 100 watts, while<br />

standard CFLs produces the same 1,600<br />

lumens using only 23 watts.[ii] By implementing<br />

CFLs instead of incandescent light bulbs, a<br />

77% energy saving can be achieved. An<br />

average household can save 13.09% of their<br />

electricity bill by switching to the more efficient<br />

CFLs. Total U.S. electricity consumption could<br />

be reduced by 9.24%, while giving consumers<br />

an annual tax-free return of 476%.<br />

Without taking into consideration the energy<br />

efficiency of CFLs, incandescent lights are still<br />

more expensive in the long run because<br />

incandescent light bulbs have a shorter<br />

expected lifetime. Richard A. Muller, in his<br />

book Energy For Future Presidents, explains<br />

“A tungsten bulb lasts typically 1,500 hours…<br />

that means that over the 10,000 hour lifetime of<br />

the CFL, you would have to buy more than six<br />

ordinary bulbs at a total cost over $2.”<br />

However, for my calculations I will give CFLs a<br />

handicap and only use the greater efficiency to<br />

calculate the annual return a consumer would<br />

achieve by switching to CFLs. I will compare a<br />

1,600 lumens, 26-watt Longstar brand CFL<br />

costing $3.89, to a 1,600 lumens, 100 watt GE<br />

brand incandescent light bulb costing $0.83.<br />

For my calculations I used 5 hours a day of<br />

typical light use, and $0.11 per kWh.<br />

Effective interest rate = (100%/payback period)<br />

= 476%<br />

Try earning a 476% return with any other<br />

investment!<br />

Sources:<br />

Energy Information Administration<br />

Home Depot<br />

Energy for Future Presidents<br />

Bulbs.com<br />

Amazon

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