Abstract: Discharge lamp includes a ceramic metal halide lamp having a central barrel enclosing a discharge space containing a fill gas and opposed end plugs which receive electrode lead-ins therethrough. A conductive ring is provided around each end plug, which is preferably polycrystalline alumina (PCA). These rings are connected by an antenna on the central barrel and thereby capacitively coupled to the lead-ins. The rings and the antenna are preferably sintered tungsten which is coated on the arc tube in paste form prior to sintering. When a voltage is applied across the electrodes, the resulting electric field causes the PCA to emit UV radiation which stimulates photoelectrons to initiate a discharge in the fill gas.

Abstract: The high pressure discharge lamp has an elongate discharge vessel of ceramic material. The outside surface area of the wall of the discharge vessel is strongly increased by a relief. Since a higher heat flow from the discharge vessel to the environment is possible, the lamp can withstand a higher load. In this way, lamp properties such as luminous flux, color rendering index and/or color temperature can be improved.

Abstract: The invention relates to a high-pressure sodium discharge lamp provided with a discharge vessel having a longitudinal axis 1 and a diameter D. The discharge vessel is enclosed by an outer envelope. Within the outer envelope a starting circuit is arranged, which has at least a glow starter. According to the invention, the outer envelope is a clear outer envelope and the glow starter is arranged so as to be laterally displaced over a distance of at least D/2 with respect to the discharge vessel. Moreover, the glow starter is shielded for the major part with respect to the discharge vessel by means of a heat shield.

Abstract: A gas flow device for a welding electrode includes a metal sleeve to form a concentric chamber surrounding the electrode, a plastic cap enclosing the rear end of the chamber, an inert gas inlet into the chamber and a quantity of steel wool between the forward end of the chamber and the electrode.

Abstract: A high pressure discharge lamp having a wire connected to at least one of the electrode assemblies of its arc tube. The wire is formed with two separated legs joined at a common point. The legs are both bent toward the common point. The distance between the legs of the wire contracts and expands to compensate for the expansion and contraction of the lamp's arc tube as the lamp is turned on and off.