Are Christmas Lights in Series or Parallel? - Homewares Insider
How come Christmas lights don't dim when strands are connected together if they're wired in series? More load in a series equals more resistance, and less amperes, right? - Quora
How Christmas Lights work (why when one bulb burns out they all go out, and about new lights) - YouTube
Are Christmas Lights in Series or Parallel? | WIRED
Battery Christmas Lights: How to convert Xmas lights to run on batteries/DC (regular or LED)
Red-tag Joe's introduction to LED lighting and how to connect 120 volt LED christmas lights for low-voltage applications redtag