A reconnection system re-forms a control tree for an application that is executed in parallel without terminating execution of the application. If one component is real, the other component is simulated so as to be sufficiently responsive to responses from the real component such that the real component is unable to discern that the other component is not also real. The insulating member is inserted into the cooling water passage and contacts an inner surface of the cooling water passage. A fixed roof panel closes off a first portion of the roof. This in turn improves emission efficiency of the light source, ultimately realizing a high quality light source. The top sockets are oriented in a downward direction so as to be opposed to the base sockets.