Why do energy-saving lightbulbs take time to reach full brightness?

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Offline thedoc

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Oliver Clark  asked the Naked Scientists:
   
Hi Chris,

Great Show

Why do energy saving lightbulbs take so long to get to a bright light and why is this level still dimmer?

Oliver Clark (Aged 12)

What do you think?
« Last Edit: 01/04/2012 09:41:02 by _system »