[en] A scalable transverse self-sustained discharge maintained between an array of flow-stabilized cathodes and a common anode has demonstrated specific input powers of 800 W/g/sec and power densities of 100 W/cm3 per cathode for CO2-N2-He mixtures at pressures of 50--70 Torr. Optical extraction at 15% efficiency has been obtained under nonoptimized conditions in a geometry with the parallel fluid flow and discharge electric field perpendicular to the optical axis