Patent ID: 7550924

Claim:
A high-pressure discharge lamp comprising: an outer envelope in which a discharge vessel is arranged around a longitudinal axis, the discharge vessel enclosing, in a gas-tight manner, a discharge space provided with an ionizable filling, the discharge vessel having a first and a second mutually opposed neck-shaped portion through which a first and a second current supply conductor, respectively, extend to a pair of electrodes arranged in the discharge space, a lamp base of electrically insulating material supporting the discharge vessel by means of the first and second current supply conductors, the lamp base also supporting the outer envelope, the outer envelope enclosing the first and second current supply conductors, and the outer envelope being connected to the lamp base in a gas-tight manner, an exhaust tube for evacuating the outer envelope provided in the lamp base or in the outer envelope, wherein the exhaust tube in the lamp base is made from a NiFeCr alloy, wherein the ratio of the distance d e between the electrodes to the height h dl of the high-pressure discharge lamp along the longitudinal axis complies with: 0.02 <d e /h dl <0.2.