The wonder of your childhood Christmas holidays was only enhanced by the magic of the old-fashioned Christmas bubble lights that trimmed your family s Christmas tree. Although these nostalgic lights were originally found in England they were first patented in the U.S. in the 1940s. Their popularity spanned the 1940s to the 1970s before miniature Christmas lights became the go-to tree lighting option. Today Christmas bubble lights are reminiscent of the simpler times in our childhoods; they are also used to create a retro vintage vibe in your home s Christmas decor. If you re a fan of these nostalgic bubble light Christmas tree lights you know just how difficult they are to find. You ve come to the right place for Christmas bubble lights: Walter Drake.Each liquid-filled vial is heated by the enclosed incandescent light bulb causing the liquid to bubble and boil. The result? A positively mesmerizing decorative effect! Made from glass and heat-resistant plastic each of our Christmas tree bubble strand lights have seven 4 1/2 high Christmas bubble lights that are spaced 19 apart.