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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