Abstract: The invention relates to a luminaire (2) and an illumination system (12). The luminaire according to the invention comprises a light exit window (30) for emitting light from the luminaire, and a reflective screen (40) arranged opposite the light exit window. The luminaire further comprises a light source (20) which is arranged for indirect illumination of the light exit window via the reflective screen. The light source is arranged near the light exit window on an imaginary plane P substantially parallel to the light exit window and emits light away from the light exit window. The luminaire further comprises a specularly reflective part (43) as part of the reflective screen, which specularly reflective part is concavely shaped for reflecting at least part of the light emitted by the light source towards a diffusely reflective part (42) of the reflective screen.

Abstract: A light-emitting panel comprising a plate-like translucent member (1) having a light-emitting front side (3) and, parallel thereto, a rear side (4) which has a plurality o f cavities (2). Light can be coupled out by specular reflection from surfaces (8) of the cavities (2). Each cavity (2) has a side wall (7) and a bottom (8), which extends at an angle to said rear side (4). Each cavity (2) comprises a filler element (10) which is in optical contact with a major portion of the side wall (7) of the cavity (2), while there is a distance between the filler element (10) and the bottom (8) of the cavity (2) in order to form a closed space (11).

Abstract: An illumination system comprising at least two closely arranged light sources, each emitting a unique light spectrum during operation, and an optical system (1). The optical system comprises a light guide (4) with an incoupling face (6) and an outcoupling face (7). The optical system further comprises a mirroring transition part (8) connecting the outcoupling face of the light guide with a transparent light extraction panel (9). The transparent light extraction panel has an extraction structure (11) for outcoupling of light to the exterior. The light guide and the extraction means are specular reflective, the mirror preferably being about specular reflective. Compared to the known illumination systems the illumination system of the invention is both relatively efficient and has an improved control of the light beam.

Abstract: The luminaire comprises several flat, light-diffusing lamellae (10) between reflectors (1) which each comprise an edge (2) in a light emission window (3). Each lamella has lateral edges (100), an outer edge (12), an inner edge (11), and a relief (101). The relief (101) of the lamella (10) decreases in a direction towards the lateral edges (100), hence avoiding non-uniform light reflections (zebra patterns) of the lamellae (10) on the reflectors (1).

Abstract: The luminaire comprises various flat, light-scattering lamellae (10) extending between elongated reflectors (1) having a longitudinal edge (2) in a luminous window (3). The lamellae (10) have a concave outer edge (12) in the luminous window (3) and a convex inner edge (11). Undesirable reflections are precluded by the convex inner edge (11), while screening of the electric lamp to be accommodated is maintained.

Abstract: The luminaire for a tubular electric lamp (3) has, in a housing (1) with a light emission window (2) in plane P, reflectors (5) at either side of the lamp (3) and a number of slats (10) transverse to the reflectors (5) below the lamp (3). The slats (10) are V-shaped in cross-section and have an inner surface (11) facing the lamp (3). The inner surface (11) has a central zone (12) and flanks (13) which extend at an angle away from plane P. The inner surface (11) has end zones (14) near the reflectors (5) which are in a plane Q parallel to plane P. The longitudinal axis (4) of the lamp (3) is situated in a region extending from plane Q towards plane P. Although the slats are relatively small, bright spots within the shielding angle of the luminaire are avoided.

Abstract: A luminaire has a housing with a light emission window (2), a tubular lamp supported in the housing facing the window (2) and having a center line extending in a plane P perpendicular to the window (2), side reflectors (5), and three-dimensional lamellae (10) which each have an outer edge (11) and a pair of inner edges (12). The outer edge of each lamellae is concave in a direction transverse to the window. The luminaire thus provides an optimized cut-off angle, screening light which would otherwise be dazzling but permitting non-dazzling light to pass. Each of the lamellae has a concave curvature in a direction parallel to the plane P but which flattens out going from plane P towards the side-reflectors (5). That enlarges the aperture through which light emanates and makes the illumination provided by the luminaire more uniform.

Abstract: An electric lamp arrangement includes a reflector (10) having first and second mirror walls (12 and 22), which in axial sections are curved according to circular arcs (13, 23), the centers of which lie in an area between lines (15, 16) enclosing angles .beta. and .gamma. with a plane P defining the largest diameter (d), and in an ellipse-shaped area Q, respectively. The reflector has a relatively small, light-emitting window (30) of at most 0.7 d, disposed opposite a lamp base (1). An electric light source (3) is disposed within the reflector (10) near plane P and an axis (11). The reflector (10) may be integral with a lamp vessel (5) to give a reflector lamp or a pressed-glass lamp. Alternatively, the light source may have an envelope and may be secured within the reflector to constitute a lamp-reflector unit. The reflector effectively shapes radiation emitted by the light source into a wide beam of high intensity.

Abstract: The reflector lamp has a lamp vessel (1) whose second portion (7) and third portion (10) are mirror-coated. A light source (17) is positioned axially on either side of the greatest diameter (3). The lamp gives a light beam with a high luminous flux and a high luminous intensity in the beam center.

Abstract: The reflector lamp with lamp vessel (1), whose second portion (8) and third portion (11) are mirror-coated and form cooperating reflector portions, has an axially positioned light source (15) which extends in front of and behind the greatest diameter (3). The lamp forms a beam with a high luminous flux and a high luminous intensity in the beam center.

Abstract: An electric incandescent lamp includes a lamp vessel having an axis and a reflective coating. Within the lamp vessel two filaments are arranged in a disc-shaped space transverse to the axis and which are electrically connected in series, the second end portion of the first filament being electrically connected to the first end portion of the second filament. Mains voltage is applied between the first end portion of the first filament and the second end portion of the second filament. The filaments are arranged opposite each other so as to substantially surround the axis of the lamp vessel, and are closest to each other at the corresponding end portions thereof. Such end portions are separated by a gap in either or both the axial and transverse directions. The lamp produces a symmetrical light beam of high intensity at its center.

Abstract: The electric incandescent lamp according to the invention has a lamp vessel (1) comprising a second wall portion (6) opposite to a neck-shaped first wall portion (4). Between the largest diameter (3) and the second wall portion (6) is disposed a third mirror-coated wall portion (7,7'), which is mainly curved in axial section along the arc of a circle, whose center (8,8') is located on the other side of the axis of symmetry (2) and of a plane passing through the largest diameter (3). The filament (10) has a plane of symmetry passing through the axis of symmetry (2) and extends on either side of a second plane through said axis at right angles to the first plane. The lamp produces together with an external reflector a narrow beam with a high luminous flux at the center thereof.

Abstract: The electric incandescent lamp has a blown glass lamp vessel having a neck-shaped wall portion, a parabolically curved wall portion which extends substantially transversely and a wall portion curved in accordance with an arc of a circle which extends substantially in the axial direction. A filament is arranged in a plane through the foci of the wall portion and at least partly coincides therewith. The electric incandescent lamp has the advantage that, independent of its finish it has a lamp vessel of the same shape and the same mounting means for the filament. The manufacture of incandescent lamps of different types is thereby simplified considerably.

Abstract: The electric incandescent lamp has a multi-use lamp vessel having a neck-shaped wall portion, a wall portion which is curved in accordance with a first circuit arc and extends substantially in the transverse direction, and a wall portion which is curved in accordance with a second circular arc and extends substantially in the axial direction. A filament is arranged in the proximity of the largest diameter. The electric incandescent lamp has the advantage that, independent of its finish it has a lamp vessel of the same shape and the same mounting means for the filament. The manufacture of incandescent lamps of different types is thereby simplified considerably.