Tuesday, July 24, 2007

$500 Profit

You may have noticed on Friday's post (if you looked really closely) that on the pack, there was a claim that the 6 energy-saving lights would save over $500.

Being the kind of guy who likes to do calculations, i decided to check it out. For each bulb, i calculated the power saving, multiplied by the expected lifetime of the bulb (much longer than old-style bulbs) and then multplied by the price of electricity (before the July 1 increase).

The answer was $549. Even if hadn't got them for free, it would still be a $500 saving. Incidentally, that would also be a greenhouse saving of 7 tonnes of carbon dioxide. Pretty good, for something i can carry in one hand!

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