iodide xenon and or other gases the envelope 1 is surrounded by a transparent outer envelope 3 the envelope 1 of the lamp is provided with two sealed portions 4 5 at opposite ends of the envelope 1 each sealed portion 4 5 comprises a molybdenum foil member 6 7 embedded in the quartz glass material of the envelope 1 each molybdenum foil member 6 7 is connected to the end of an electrode rod 8 9 and the other end of each electrode rod 8 9 projects into the gas discharge space 2 the electrode rods 8 9 are made of tungsten which may comprise an additive e g tho 2 at least at their surfaces each of the two molybdenum foil members 6 7 is also connected to lead out wires 10 11 respectively which project outside the quartz glass material of the envelope 1 so that they can be connected to means for supplying electric power the electric power is supplied to the electrode rods 8 9 through the molybdenum foil members 6 7 the lamp is provided with a cap 12 in order to connect the lamp to a lamp holder the cap 12 of the lamp is provided with contact elements not shown to be connected to corresponding contact members in the lamp holder so that electric power can be supplied through these contact members from the lamp holder to the lamp lead out wire 10 is connected to one of said contact elements and the other contact element is connected to an electric current guiding rod.