When did lighted trees become popular in cities? I'm referring to lights on regular trees, not trees put up for the holidays. An online search for lighted trees images results in many, many examples. I wonder if they actually increase the number of visitors (shoppers) to an area, if they increase the time visitors spend in an area, and/or if they increase the morale of visitors and employees in an area. I like lighted trees but they aren't enough to influence my shopping behavior. They do put me in a better mood, though, because they give the area a festive appearance. If they were lit all year, I wouldn't even notice them after a while.