High Quality Content by WIKIPEDIA articles! Lucas Desmond Horton (previously Roberts) and Samantha Gene "Sami" Brady are a fictional couple on the American soap opera Days of our Lives they are known as LUMI. Lucas is played by Bryan Dattilo and Sami is played by Alison Sweeney. They are often referred by the portmanteau "Lumi" (for Lucas and Sami) on internet message boards. TV Guide recognizes the pairing as a good supercouple within today`s daytime medium.