How to Lengthen Christmas Lights

[@dh4880]

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[@lynnm5267]

still questioning the resistor you need to slow down the wattage going from 50 to only 20?? thanks

[@MikeBrimberry-s5b]

Is it possible to lengthen a string of LED (or incandescent) Christmas lights by 3 or 4 lights (or any other number of lights)?