Abstract: The invention relates to a color-tunable illumination system (10), to a lamp and to a luminaire. The color-tunable illumination system comprises a light source (20) emitting light of a first predefined color (B), and comprises a luminescent material (30) for converting light of the first predefined color into light of a second predefined color (A). The color-tunable illumination system further comprises shielding means (40, 42) arranged for preventing at least part of the light emitted by the light source to impinge on the luminescent material. The light source, the luminescent material and/or the shielding means are changeable from a first situation to a second situation. In the first situation the color-tunable illumination system is arranged for shielding at least part of the luminescent material against impinging light of the first predefined color.

Abstract: The invention relates to an assembly of a capped high-pressure discharge lamp (1) and a lamp holder (50). The discharge lamp comprises an outer envelope (10) in which a discharge vessel (11) is arranged. The outer envelope has a pinched portion (20) provided with a clamping member (25). A lamp cap comprises a substantially circular-cylindrical cup shaped portion for receiving the clamping member and is provided with a protruding collar (36). The lamp holder (50) comprises a substantially circular-cylindrical flange (55) for receiving the cup-shaped portion such that the flange engages the protruding collar. An inner diameter of the flange (55) has a tolerance of less than or equal to ?0.2 mm. An outer diameter of the cup-shaped portion (33) has a tolerance of less than or equal to +0.2 mm. The respective tolerances extend over a length of at least 2.5 mm, measured with respect to the protruding collar.

Abstract: The invention relates to a lamp comprising a lamp bulb (2) and a lamp base (3), which lamp base (3) comprises a projection (4) located in a substantially central position of the lamp base (3) and extending in a direction away from the lamp bulb (2), at least one lock-engaging portion (6), and a substantially flat base surface (5) opposed to the lamp bulb (2) and surrounding the projection (4), characterized in that the at least one lock-engaging portion (6) is located on the edge of the base surface (5) surrounding the projection (4) remote from the central projection.

Abstract: The electric discharge lamp comprises a shell (1) having an axis (2), which shell accommodates a starter (3) and pin-shaped contacts (4) extending in an axial direction. A cover (27), which is coupled to a discharge vessel (20), is attached to the shell (1). Pairs (23) of current conductors (24) emanate from the discharge vessel (20). The conductors (24) of each pair (23) are clamped, in a direction transverse to the axis (2), by first and second (6) forked contact elements, which are secured in the shell (1) and are directed towards the cover (27). The lamp is of a simple construction, which can be readily produced.

Abstract: The electric discharge lamp comprises a shell (1) having an axis (2), which shell accommodates a starter (3) and pin-shaped contacts (4) extending in an axial direction. A cover (27), which is coupled to a discharge vessel (20), is attached to the shell (1). Pairs (23) of current conductors (24) emanate from the discharge vessel (20). The conductors (24) of each pair (23) are clamped, in a direction transverse to the axis (2), by first and second (6) forked contact elements, which are secured in the shell (1) and are directed towards the cover (27). The lamp is of a simple construction, which can be readily produced.