Low energy Vs filament

Energy saving light bulbs function in much the same way as a fluorescent tube.

They contain a minute amount of mercury, just enough to cover the tip of a ballpoint pen.

This mercury allows them to deliver their substantial energy saving benefits.

Energy saving light bulbs use between a fifth and a quarter of the electricity of filament bulbs to generate the same amount of light.

So where you'd normally use a 60W bulb, you'll only need an 11-14W energy saving light bulb equivalent.