High-performance gas discharge lamps generating UV radiation are employed mainly to kill pathogens in water treatment and for UV curing of paints in industrial plants. The challenge this poses is the need to keep the plasma in the lamps thermally stable to achieve an optimum effect. In conventional gas discharge lamps, a thermal balance is achieved by an external vacuum space or by active cooling. Cooling is either by a flow of air or liquid around the discharge vessel or by rotation of the complete discharge vessel about its axis. The temperature gradient this produces entails high energy losses, which must be offset by an additional heat input.An invention from the Light Technology Institute (LTI) achieves efficient temperature stabilization without the drawback of energy loss. The core of the invention is a novel lamp design with a vacuum space inside the gas discharge vessel. The temperature is controlled through the shape and size of the vacuum space reducing heat transfer. Consequently, the plasma is operated only in the boundary areas in which optimum operation can be set especially in electrodeless lamps. Thermal losses inside the lamp are minimized. The KIT is looking for partners for industrial use of the technology.