Assembly of a Capped High-Pressure Discharge Lamp and a Lamp Holder

An assembly of a capped high-pressure discharge lamp (1) and a lamp holder (50),

• the capped high-pressure discharge lamp (1) comprising:
• an outer envelope (10) in which a discharge vessel (11) is arranged around a longitudinal axis (22),
• the discharge vessel (11) enclosing, in a gastight manner, a discharge space (13) provided with an ionizable filling,
• the discharge vessel (11) having a first (2) connection portion and a second (3) opposite connection portion through which a first (4) and a second (5) current-supply conductor, respectively, extend to a pair of electrodes (6, 7) arranged in the discharge space (13),
• the outer envelope (10) having a pinched portion (20) supporting the discharge vessel (11) via the first and second current-supply conductors (4, 5),
• the pinched portion (20) being provided with a clamping member (25) surrounding the pinched portion (20) with a clamping fit,
• a lamp cap (30) having a base portion (32) of an insulating material and a substantially circular-cylindrical cup-shaped portion (33) for receiving the clamping member (25),
• the cup-shaped portion (33) being provided with a protruding collar (36),
• the base portion (32) being provided with a first (34) and a second (35) contact member projecting beyond the cup-shaped portion (33), the first and second current-supply conductors (4, 5) being electrically connected to the first and second contact members (34, 35), respectively,
• the lamp holder (50) comprising:
• a base portion (60) and a substantially circular-cylindrical flange (55) for receiving the cup-shaped portion (33) of the capped high-pressure discharge lamp (1),
• the base portion (60) being provided with first (74) and second (75) connection means,
• wherein
• the flange (55) of the lamp holder (50) receives the cup-shaped portion (33) of the capped high-pressure discharge lamp (1) such that the flange (55) engages the protruding collar (36) of the cup-shaped portion (33) and the first and second contact members (34, 35) make electrical contact with the first and second connection means (74, 75), respectively,
• an inner diameter of the flange (55) having a tolerance of less than or equal to −0.2 mm,
• an outer diameter of the cup-shaped portion (33) having a tolerance of less than or equal to +0.2 mm,
• the respective tolerances extending over a length of at least 2.5 mm, measured with respect to the protruding collar (36) along the longitudinal axis (22).