A discharge lamp of the short arc type having a trigger wire which can be installed in a state which is suitable for a directional capacity of the electrode regardless of what type of base the lamp has is achieved by the trigger wire on the outside surface of an arc tube having the following characteristic:. The molds for rotationally molding may include an interior surface, an exterior surface, an opening, and a post. The network availability analysis system produces an availability graph using that topology and performs an availability analysis setting forth the availability properties of the specified network topology.