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Do plug-in night lights use a lot of electricity?

No, modern plug-in night lights, especially LED ones, use very little electricity, costing mere pennies per month and adding a negligible amount to your overall energy bill, as they typically consume only 0.5 to 7 watts. While old incandescent versions use more power (4-7 watts), even they are energy-efficient for their purpose, making them a very inexpensive and low-impact lighting choice for continuous use.