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A CFL uses 65% less energy and can reduce your power bill as well.

A longer answer

Since major improvements in the design of Compact Fluorescent Lamps (CFLs) from 1990 onwards, by using a CFL light bulb 80% energy of the energy can be saved compared to the energy that is needed to produce a given amount of artificial light using conventional incandescent filament bulbs.

In other words, to produce the same amount of visible light, a modern CFL uses only 1/5 (one fifth) of the power that an incandescent filament bulb uses.

For example, a 20 watt CFL bulb produces similar light to a 100 watt incandescent filament bulb and a 30 watt CFL matches the light output of a 150 watt incandescent filament bulb.

CFLs also have a much longer useful life-span, thus avoiding the need to change them as often as incandescent light bulbs.

Another opinion

There are issues with the additional power used to manufacture CFL bulbs and the toxic chemicals inside these units.

But, whilst they certainly do save energy for the end user, their drawbacks are that they probably use more energy overall and their manufacture causes more pollution.

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11y ago

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