Assembly of a capped high-pressure discharge lamp and a lamp holder

An assembly of a capped high-pressure discharge lamp and a lamp holder, comprising:

• a capped 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 gastight manner, a discharge space provided with an ionizable filling,
• the discharge vessel having a first connection portion and a second opposite connection portion through which a first and a second current-supply conductor, respectively, extend to a pair of electrodes arranged in the discharge space,
• the outer envelope having a pinched portion supporting the discharge vessel via the first and second current-supply conductors,
• the pinched portion being provided with a clamping member surrounding the pinched portion with a clamping fit;
• a lamp cap having a base portion of an insulating material and a substantially circular-cylindrical cup-shaped portion for receiving the clamping member,
• the cup-shaped portion being provided with a protruding collar,
• the base portion being provided with a first and a second contact member projecting beyond the cup-shaped portion, the first and second current-supply conductors being electrically connected to the first and second contact members, respectively;
• and
• a lamp holder comprising:
• a base portion and a substantially circular-cylindrical flange for receiving the cup-shaped portion of the capped high-pressure discharge lamp,
• a cylindrical body of an insulating material arranged with clearance in the base portion of the lamp holder and a resilient means between the cylindrical body and the flange of the lamp holder, the cylindrical body engaging, under resilient pressure, the flange when the flange receives the cup-shaped portion;
• the base portion being provided with first and second connection means,
• wherein the flange of the lamp holder receives the cup-shaped portion of the capped high-pressure discharge lamp such that the flange engages the protruding collar of the cup-shaped portion and the first and second contact members make electrical contact with the first and second connection means, respectively.