How does a lightbulb work?

What's actually going on in a lightbulb when you switch it on? And why are energy saving bulbs more efficient than normal incandescent ones? Find out in the latest Naked...
18 February 2011
Presented by Sarah Castor-Perry

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What's actually going on in a lightbulb when you switch it on? And why are energy saving bulbs more efficient than normal incandescent ones? Find out in the latest Naked Science Scrapbook.

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