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The amount of money can you save by turning off lights is directly determinant on how many lights you have running, at what power rating and for what amount of time. For instance if you have one light bulb with a 75 watt rating running for 100 hours that will be 75kW-hours (where kW is equal to W x 10^3 or W x 1000) kilo-watt hours are a typical measurement in household meter boxes. If your electricity is being supplied at $0.08/kw-h then it is simply 75 x 0.08 which is equal to $6.00. therefore you can see that, with numerous lights, turning them off can offer a substantial saving over a long period of time, not to mention an important environmental benefit.

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