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One of the highlights of the Christmas season is riding around and looking at the numerous light displays, made famous by Chevy Chase in the 1989 classic film, "National Lampoon's Christmas Vacation." While Clark Griswold's attempt may have been a futile attempt for most of the movie, there are those who know how to get it right. To find out how it's done, we sat in with an exterior lumination expert in Lexington.