Halogen incandescent lamp

A halogen incandescent lamp which comprises:

• a lamp vessel of a high-melting-point transparent material which is resistant to halogen, at least three molybdonum internal current conductors disposed in said vessel, at least two tungsten filaments stretched between said internal current conductors, said lamp vessel comprising a vacuum-tight seal having a plurality of current leadthrough conductors incorporated therein which are each in electrical contact with one of said internal current conductors, a plurality of external current conductors extending outside said lamp vessel, each of said external current conductors being connected to one of said leadthrough conductors, said lamp vessel being filled with a halogen-containing inert gas, said lamp vessel consisting of an alkali-alumino-borosilicate glass having a coefficient of expansion of 31 - 37 .times. 10.sup.-7 .degree. C.sup.-1 at 0.degree.-300.degree. C, said internal current conductors being a molybdenum wire having a minimum diameter of 400 microns, a glass bead of the kind of glass from which the material of the lamp vessel is selected being disposed in surrounding vacuum tight relationship to at least the part of each of said molybdenum wires which extend in said vacuum-tight seal of said lamp, the ratio between the diameter of the molybdenum wires and the wall thickness of the glass bead being larger than 2 and the angles at which the glass of the lamp vessel contacts the glass of the bead, measured through glass, being at most 90.degree..