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This statistic represents the Christmas light wattage for standard U.S. household circuits, by Christmas light type. A standard U.S. household circuit has 15 amperes, 120 volts and 1440 watts. While commercial mini light strings with 50 lights require 20.4 watts, LED mini-light strings - despite having 70 lights - only require 4.8 watts, presenting Americans who want to blind their neighbours with their Christmas decorations with a more energy efficient and brighter result.