Abstract: A luminaire has a concave reflector with an optical center on an optical main axis in an optical main plane. A screen extends along the optical main axis to a light emission window. The reflector has a first faceted reflector portion at a first side of the optical main plane, the optical center being its focus and the optical main axis being its axis. A second faceted reflector portion is present at a second side of the optical main plane, having a secondary axis passing through and a focus lying in the optical center. The secondary axis is tilted with respect to the main axis through acute angles in the main plane as well as out of the plane. The luminaire produces a screened-off light beam which is horizontally and vertically asymmetrical, which makes the luminaire suitable for an illumination of highways in a counter-traffic direction.

Abstract: The luminaire has a reflector (10) having a light emission window (15), near to first opposed edges (16) of which respective sets of strips (25) are present to create a cut-off angle ?. The reflector (10) is closed by a hood (30) which, along first walls (31) thereof close to the first edges (16), have refracting elements (35) to cause the luminaire to emit light at small angles to the light emission window (15), within the cut-off angle ?. The luminaire is suitable to be used for under canopy lighting of a petrol station and to signal to the distance that the station is open, without dazzling oncoming drivers. The method involves the use of the luminaire mounted to the ceiling of the canopy.

Abstract: The luminaire has a reflector (10) having a light emission window (15), near to first opposed edges (16) of which respective sets of strips (25) are present to create a cut-off angle ?. The reflector (10) is closed by a hood (30) which, along first walls (31) thereof close to the first edges (16), have refracting elements (35) to cause the luminaire to emit light at small angles to the light emission window (15), within the cut-off angle ?. The luminaire is suitable to be used for under canopy lighting of a petrol station and to signal to the distance that the station is open, without dazzling oncoming drivers. The method involves the use of the luminaire mounted to the ceiling of the canopy.

Abstract: The luminaire has a concave reflector (1) with an optical center (2) on an optical main axis (3), in an optical main plane (4). A screen (6) extends along the main axis (3) up to a light emission window (5). The reflector (1) has a first facetted reflector portion (10) at the first side of the main plane (4), which extends through the main plane (4) and which may be curved pardboloidally, the optical center (2) being its focus and the main axis (3) being its axis. A second facetted reflector portion (20) is present at the other side of the main plane (4) and may be curved parabolically, having a secondary axis (22) passing through and a focus lying in the optical center (2). The secondary axis (22) is tilted with respect to the main axis (3) through acute angles in the main plane (4) as well as out of said plane (4).

Abstract: The luminaire comprises a reflector body (1) which has a reflecting coating (2) on its reflection side (3), and means (4) for accommodating an electric lamp on the reflection side (3). The reflection side (3) has an area (31) with a metal reflecting surface. The area (31) may have a metal sheet cover (32). The cover (32) may follow the surface of the area (31), or it may be spaced apart therefrom. The luminaire benefits from the low absorption of light by the coating (2), and from the high specular reflection of metal in the area (31) to give a high light intensity in a direction determined by the position of the area (31) with respect to a lamp accommodated by the means (4).

Abstract: The luminaire comprises a concave reflector (1) with an optical center (2) on an optical main axis (3), in an optical main plane (4). A screen (6) extends along the main axis (3) up to a light emission window (5). A panel (7) extends at a first side of the main plane (4) from the screen (6) up to the light emission window (5). The reflector (1) includes a first, faceted reflector portion (10) at the first side of the main plane (4), which extends towards the main plane (4), and which may be parabolically curved, the optical center (2) being its focus and the main axis (3) being its axis. A second, faceted reflector portion (20) is present at the other side of the main plane (4) and may be parabolically curved, which reflector portion has a side axis (22) passing through the optical center (2), and a focus lying in the optical center (2). The side axis (22) is tilted, with respect to the main axis (3), through acute angles in the main plane (4) and out of said main plane (4).

Abstract: The luminaire comprises a concave reflector (1) with an optical center (2) on an optical main axis (3), in an optical main plane (4). A screen (6) extends along the main axis (3) up to a light emission window (5). A panel (7) extends at a first side of the main plane (4) from the screen (6) up to the light emission window (5). The reflector (1) includes a first, faceted reflector portion (10) at the first side of the main plane (4), which extends towards the main plane (4), and which may be parabolically curved, the optical center (2) being its focus and the main axis (3) being its axis. A second, faceted reflector portion (20) is present at the other side of the main plane (4) and may be parabolically curved, which reflector portion has a side axis (22) passing through the optical center (2), and a focus lying in the optical center (2). The side axis (22) is tilted, with respect to the main axis (3), through acute angles in the main plane (4) and out of said main plane (4).

Abstract: The luminaire comprises a reflector body (1) which has a reflecting coating (2) on its reflection side (3), and means (4) for accommodating an electric lamp on the reflection side (3). The reflection side (3) has an area (31) with a metal reflecting surface. The area (31) may have a metal sheet cover (32). The cover (32) may follow the surface of the area (31), or it may be spaced apart therefrom. The luminaire benefits from the low absorption of light by the coating (2), and from the high specular reflection of metal in the area (31) to give a high light intensity in a direction determined by the position of the area (31) with respect to a lamp accommodated by the means (4).

Abstract: The luminaire has a concave reflector (2) including a light-emission window (3) and a plane of symmetry S transverse thereto. The reflector (2) has first opposing walls (21) which extend along the plane of symmetry S, and second opposing walls (26) which extend at right angles thereto, and a top wall (27). The top wall (27) has an opening (28) which is covered with a reflecting shade (30) having first faces (31) along the plane of symmetry S, and second faces (36) at right angles to the plane of symmetry S, and a top face (37) opposite the light-emission window (3). A holder (4) positions an electric lamp e.1. in the opening (28) and in the plane of symmetry S. The luminaire is compact and suited to illuminate covered traffic areas.

Abstract: The luminaire has an elongate concave reflector (1) defining a light-emission window (2), supports 3) for positioning electrical fluorescent tubes (4, 5) and a row of lamellae (6) in the light-emission window (2). A prismatic reflector element (7) extends in the longitudinal direction of the reflector (1) and has its base (72) in the light-emission window (2) and its top (71) next to the fluorescent tubes (4, 5). The luminaire, when mounted to a ceiling, can suitably be used to illuminate vertical surfaces, while the floor is illuminated to a smaller extent only.

Abstract: The luminaire has a concave reflector (1) with an optical axis (3) in a plane of symmetry (2), suitable to receive an elongate light source transverse to said plane (2). The reflector (1) is composed of flat facets (10,10′) which are bounded by first parallel planes (8) which are transverse to the plane of symmetry (2), and which facets (10,10′) are arranged in rows (11,11′) by second planes (9) which are parallel to the plane of symmetry (2). The first planes (8) are at an acute angle to a light emission window (5). The reflector (1) touches the window (5) at one side of the axis (3) and is extended by a light reflecting screen (7) up to said window (5) at the opposite side of the axis (3). The luminaire can be used to illuminate sports fields, the light emission window (5) being directed downwards, has a sharp cut-off angle and prevents stray light above the horizontal.

Abstract: The luminaire has a concave reflector (1) built up from plane facets (4). The facets are arranged in rows (7) which extend between first parallel planes (8) towards the light emission window (3). The facets are also bounded by second parallel planes (9). The first and the second parallel planes extend parallel to the axis (2) of the reflector, but transversely to one another. A lamp holder (30) is present for holding an electric light source (31') in a plane transverse to the plane of symmetry (6) of the reflector. The luminaire is suitable for concentrating the light generated by the light source into a comparatively wide beam and for illuminating a field from a small distance with a high degree of homogeneity.

Abstract: A luminaire includes a reflector in a housing, a lampholder for accommodating an electric lamp parallel to a light-emission window of the housing and to second sides thereof, and a light transmissive pane closing the window. Light-screening lamellae are present near the window, transverse to the main direction of the lamp. The luminaire has lamellae in regions adjacent first sides of the window, only; a central region of the window being free of lamellae for allowing easy replacement of the lamp through the central region not occupied by the lamellae. In an embodiment of the luminaire the lamellae are not linked to the pane. The luminaire allows for an easy replacement of the lamp and easy cleaning of the pane. An increased light output is obtained, too.

Abstract: The luminaire has a concave reflector (1) built up from plane facets (4). The facets are arranged in rows (7) which extend between first parallel planes (8) towards the light emission window (3). The facets are also bounded by second parallel planes (9). The first and the second parallel planes extend parallel to the axis (2) of the reflector, but transversely to one another. A lamp holder is (30) 204 present for holding an electric light source (31') in a plane transverse to the plane of symmetry (6) of the reflector. The luminaire is suitable for concentrating the light generated by the light source into a comparatively wide beam and for illuminating a field from a small distance with a high degree of homogeneity.

Abstract: The luminaire for providing a primary (10) and a secondary light beam (14) comprises reflector means (9) and a lamp holder (7) within a housing (1) having a window (2) through which the primary beam passes. Remote from the window (2), the reflector means are provided with an opening (11) for a secondary beam (14). A side wall (3) of the housing (1) has a window through which the secondary beam (14) is reflected to the outside by a reflector (15). The window (13) is provided with a refractor (12) to spread the secondary beam (14). The luminaire has a color filter (11) in the path of the secondary beam and provides an even appearance of a panel illuminated by that beam.

Abstract: The high-pressure gas discharge lamp has an ovoidal discharge space with oppositely arranged rod electrodes having a electrode coils spaced from the tip ends of the electrode. The ratio between the electrode distance d and the largest diameter of the discharge space D lies between 0.75 and 1.25. The lamp has a comparatively high power of 1600-2000 W and a defined Br/I ratio of 1.5-4. When arranged transversely in a luminaire having a concave rotation-symmetrical reflector and a screen, the lamp produces an accurately defined light beam suitable for illumination of sports grounds.

Abstract: According to the invention the luminaire, which is suitable for use with an elongate cylindrical light source, has a dish-shaped reflector with an egg-shaped light emanating face. The reflector mainly comprises a number of elongate facets which are each curved concave longitudinally and transversely and which extend with their longitudinal sides substantially parallel to the light emanating face.The luminaire gives the illuminated road surface a very uniform luminance.