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This is a 36 degree lense tube with lense installed for an ETC Source Four Ellipsoidal Spotlight. It provides a wide spread of light when installed in any ETC spotlight. ETC Source Four spotlights are sold with lens tubes of 5, 10, 19, 26, 36, or 50° spread. Install this tube if your present 19-50° ETC spotlight provides a beam that's too narrow for your application.