Make a change: Green tip #5

Posted by Laura Grant on January 3, 2008
Posted in Green tips, Lifestyle

cfl.jpgWe all know that we should use compact fluorescent lights (CFLs) because they consume less electricity, but the following calculations help to drive this point home:

If you use 60-Watt incandescent bulbs and burn them for 3 hours a day using electricity that costs an average of 35c/kWh, then each bulb will cost you R1.89 a month. If you use 11-Watt CFLs, each bulb will cost 35 cents a month in electricity. By changing to CFLs, over the course of a month you’ll save 49 Watts of electricity and R1.54 in costs. In a year the savings will total R18.48.

From April the price of electricity will increase by 14.2 percent, this means your annual savings per CFL could increase to about R21. Say you have an average of 10 lightbulbs switched on every night, your savings could amount to around R200 a year.

So, even though CFLs are more expensive than conventional light bulbs, chances are you’ll recoup the extra cost in less than a year. In addition, the life expectancy of a CFL is six times that of an incandescent bulb – 6,000 hours versus 1,000 hours.

Source: Eskom, “Saving electricity means saving money”


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