Just think of this. In the kitchen we have a number of 20 watt energy efficient bulbs which replaced 100 watt old-fashioned ones. If we assume that the kitchen lights are on for 2000 hours a year, that means that each bulb doesn't use 160 KWH of electricity in a year. So that means a saving in electricity costs of about £14.40. As the bulbs cost about £6 each and so far have lasted three years, the savings are even better.
One point that people don't know, even salesman at a lighting exhibition yesterday, is how much a KWH of electricity costs. It is about NINE PENCE.
Note that you change your bulbs because they save money, not because of global warming.
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