The most popular form of energy efficient light bulb, Compact Fluorescent Lamps (CFLs) use between a fifth and a third of the power used by incandescent bulbs for any given light output.
CFLs tend to be around three times more expensive than traditional bulbs, but last between eight and 15 times longer and have become increasingly popular despite criticism from some quarters that they produce a poorer light than incandescent bulbs and require specialist disposal due to the presence of mercury.
Demand for CFLs is expected to continue to rise following moves by the EU to ban incandescent bulbs.
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