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CFLs explained

David Ogden is right, and wrong, in his analysis of CFLs (Letters, last week).

The example he quoted of a 15W CFL requiring the power station to produce 30VA (W), is only half the equation.

A 15V CFL produces the same light and replaces a 75W filament light, where the power station has to produce 75VA. Thus a CFL saves the power station 45VA output (60%).

This explains why power companies in the US have been giving away CFLs, because this is much cheaper and more environmentally friendly than building new power stations.

In the UK virtually all commercial and industrial premises have used fluorescent lamps for over 40 years, without any obvious problems to CEGB (as was). Perhaps CFLs are another "Millennium Bug"?

PROFESSOR LEWIS LESLEY, 30 Moss Lane, Liverpool L9 8AJ

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