Apparatuses are disclosed having an ultraviolet lamp and a reflector system arranged to project light emitted from the lamp to a region 2-4 feet from a floor of a room in which the apparatus is arranged. The apparatuses include a mobile carriage with wheels and one or more compartments underneath the lamp that hold operational components for the apparatus. The apparatuses are configured such that the lamp is not moveable beyond vertical planes aligned with a casing of the carriage. In some cases, a lowermost surface of the lamp is arranged at an elevation substantially level with or above an upper surface of the casing that is at least 36 inches above the floor of the room. In addition or alternatively, the carriage may include a handle exterior to its casing having an uppermost surface arranged at substantially the same level or lower than a lowermost surface of the lamp.