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One of those is the magic of “twinkling” light sets, which [Alec Watson ... can say they get their random numbers from a set of Christmas lights? If you’re curious how incandescent ...

But if you believe all forms of Christmas should be left in December (including music -- we're looking at you, Mariah Carey), then there are ways to recreate the ambient light you are sorely missing.

which means the entire string of Christmas lights will go out. Some of these could be replaced with a working bulb, but not all. The other type of circuit light strands use is a parallel circuit.