It depends on the wattage of the CFL. CFL bulbs, like all light bulbs, have the number of watts they use marked clearly on them. Watts are a measure of the rate of electricity that an appliance consumes. Total energy usage is measured in kilowatt-hours, which are literally the amount of energy consumed by one kilowatt in one hour.
To find out how much electricity your CFL uses in an hour, look at the watt number on it and divide that number by 1,000 (since a kilowatt is equal to 1,000 watts). The number you get is the number of kilowatt-hours of electricity it will use in an hour.
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