Dave Ceasar’s Christmas lights obsessions started slowly, with a larger-than-life inflatable snowman and a few strings of lights in the trees outside his Litchfield home. “We had that ...

You’re ready to decorate your Christmas tree and create a luminous masterpiece, but how many feet of lights does your 7-foot tree need to achieve the magical glow in your mind’s eye?

Specifically, [Andy] has a long string of programmable RGB LED lights to wrap around a Christmas tree, but didn’t want to spend time manually mapping out each light’s location. So he used ...