An ENERGY STAR qualified compact fluorescent light bulb or CFL uses 75 percent less energy and lasts about 10 times longer than an ordinary bulb.
A CFL bulb can typically last for about 8,000 hours. In comparison, an ordinary light bulb lasts about 900 hours only. Taking into account of its energy efficiency and longer life, a CFL outperforms an ordinary light bulb by more than 30 times. A 25-watt CFL bulb is as bright as a 100-watt light bulb.
On the other hand LED or (Light emitting Diode ) which less energy. Currently LED lights are now being used for traffic lights in Sri Lanka. The exact extent of energy saved by using LED lights are not caluclated yet, but researchers believe that it will use 1/3 of energy that is used to power a CFL bulb.
Source bits.blogs.nytimes.com
Wednesday, July 22, 2009
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