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* calculate your consumption: You should put the watts of the lamp you have if you have more than one, only have to add the watts of all the lamps.

* Daily hours:how many hours a day the lamp (s) are working.

* Rate 1KW: is the rate you pay (that varies in each country). You can find the rate on your light bill.

* Consumption day / month: how many days a month the lamp (s) are working.