The proper mounting distance for LED wall washer may vary depending on your city code, so be sure to check the instructions and guidelines for your specific light.  As a rule, mounting distance is equal to spacing distance and should equal ⅓ of the ceiling height. For spaces 9 feet or lower, mount 2 to 3 feet from the wall. For spaces 9 to 11 feet high, mount 3 to 4 feet from the wall.