Novel tumor specific phototherapeutic and photodiagnostic agents are disclosed. According to the invention, said second information streams, exchanged by the transport interface with the first circuit means and with the second circuit means, are simplified with respect to said time division frames received from said node, in particular are composed by a data stream sent in a co-directional way and by an address information sent by the transport interface. The LED light fixture also has an exterior wireway structure including a one-piece duct which has an end portion engaged with the wiring aperture and forms a channel for wires to the on-board connector. The internal combustion engine is then operated in the engine-on state to generate tractive torque responsive to the operator torque request. In an embodiment of the invention, the fluid being conveyed is electrically conductive and the detection sensor comprises an electrical conductivity sensor.