Luminaire for lighting a road

Abstract

The present invention relates to a luminaire (1) for lighting a road (2), comprising a light source (34), and an optical lighting device (20) comprising a reflector (40) having a reflector surface (42) for reflecting light emitted from the light source (34), and a cut-off element (30), wherein the optical lighting device (20) is designed such that the light of the light source (34) is emitted mainly to a road side of the luminaire (1) defined by a C0-C180 plane, and wherein the cut-off element (30) is arranged and / or designed (i) such that an upward light ratio (ULR) of the luminaire (1) is ULR < 6%, and / or (ii) to cut-off substantially any light at a gamma angle γ of more than 110 degrees.

Description

[0001] Luminaire for lighting a road

[0002] Description:

[0003] The present invention relates to a luminaire for lighting a road, comprising a light source and an optical lighting device.

[0004] Lighting of motorized traffic roads is usually made with columns with lighting fixtures set at several meters height. This ensures compliance to standard lighting calculations that should be evaluated and fulfilled when lighting the road in the direction to the traffic, e.g. as set out in standard EN 13201.

[0005] Lighting fixtures set on columns in several meters height, however, are comparatively complex to install and come along with high costs of installation and maintenance operation. In addition, inaccessibility of the lighting fixtures or lanterns during installations and maintenance operation, in particular under extreme weather conditions, fragility or configuration of the suspension structure and landscape impact are limiting or negative aspects in connection with known road lighting solutions or structures set at several meters height.

[0006] Lighting structures of less than 1 meter, e.g. lighting bollards, however, only fulfill less severe lighting scenarios, where lighting is evaluated with lower distance between fixtures. In particular, lighting fixtures at less than 1 meter are in an inefficient or unsafe position to create a uniform lighting of a road, as the glare from LED source is directly or indirectly in the field of view of the drivers. In particular, bollards usually come along with a rotational photometry and are not suitable to reach required uniformity in lighting of roads, in particular in accordance with requirements set out in EN 13201.

[0007] Lighting devices set at less than 1 meter are not suitable to solve lighting calculations compliant to safety standards for motorized traffic roads.

[0008] It is an object of the invention to provide a solution for lighting a road in an efficient manner, while also being compliant to safety standards for motorized traffic roads. In particular, a technically and economically improved luminaire is to be specified having improved maintenance with less installation effort, while also fulfilling severe lighting scenarios, as providing a uniform lighting of a motorized traffic road, in compliance with safety standards associated therewith. In particular, the disadvantages of the previously known solutions should be avoided or at least substantially reduced.

[0009] The object is solved by the features named in the independent claims. The dependent claims, the description and the figures relate to preferred embodiments.

[0010] Thus, the object is solved by a luminaire for lighting a road, comprising a light source, and an optical lighting device that comprises a reflector having a reflector surface for reflecting light emitted from the light source, and a cut-off element.

[0011] The optical lighting device is designed such that the light of the light source is emitted mainly, at least substantially and / or exclusively, to a road side of the luminaire, e.g. defined, especially limited, by the C0-C180 plane, e.g. by every C-plane in between and including the Co and C180 planes and / or the C0-C180 plane.

[0012] The cut-off element may be arranged and / or designed such that an upward light ratio (ULR) of the luminaire is ULR < 6%, preferably ULR < 5% or ULR < 4% or ULR < 3% or ULR < 2% or ULR < 1.0% or ULR < 0.8% or ULR < 0.5% or less.

[0013] The cut-off element may be arranged and / or designed to cut-off substantially any light at a gamma angle y of more than 110 degrees.

[0014] For example, the upward light ratio, abbreviated to ULR, defines the proportion of the luminous flux of the luminaire that is emitted at and above the horizontal, when the luminaire is mounted in its intended installed position / orientation. ULR maybe expressed as the fraction of output light directed upward compared to the total emission of light of the luminaire when being mounted in its intended installed position / orientation.

[0015] For example, the upward light output ratio, abbreviated to ULOR, defines the proportion of the total luminous flux of all lamps or light sources considered in the luminaire that is emitted above the horizontal plane passing through the luminaire in its intended installed position / orientation.

[0016] For example, the light output ratio, abbreviated to LOR, defines the luminaire’s efficiency in optical terms, i.e. the proportion of output flux, whereas the calculation T - LOR’ defines the luminaire’s losses. ULR can thus be equated as follows:

[0017] ULR = ULOR / LOR

[0018] For example, with respect to ULR, ULOR and LOR it is further referred to an international standard published as CIE-15O:2O17 entitled “GUIDE ON THE LIMITATION OF THE EFFECTS OF OBTRUSIVE LIGHT FROM OUTDOOR LIGHTING INSTALLATIONS, 2ND EDITION”, DOI: 10.25039 / TR.150.2017.

[0019] The optical concept of the luminaire provides a sharp and intense light distribution to create uniform lighting of the road, while avoiding undesired glare effects in the visual field of the driver. For this purpose, particularly, the optical lighting device of the luminaire is designed such that the light of the light source is emitted mainly, at least substantially and / or exclusively, to the road side, particularly defined or limited by the Co-Ci8o-plane, e.g. by every C-plane in between and including the Co and C180 planes and / or the C0-C180 plane. Hence, the road side may be arranged on one side of the luminaire.

[0020] Light distribution curves and luminous intensity are a visualized representation of the light distribution of a light source. The spatial distribution of the luminous intensity results in a three- dimensional luminous intensity distribution body, illustrated as a graph. This graph is displayed in different sectional planes through the luminaire. A distinction is made between A, B and C planes. The C-plane system is usually used with reference to the axis passing vertically through the center of the luminaire or the main light emission direction of the light source. Thus, with reference to a respective C plane, a luminous intensity distribution curve is obtained. The luminous intensity is usually entered in a polar coordinate system as a function of the beam or gamma angle y.

[0021] In other words, particularly, the spatial distribution of the luminous intensity of the luminaire is referred to as the luminous intensity distribution body. Sections through the vertical axis of the luminaire, i.e. the main extension of the light source or light emission direction, represent luminous intensity distribution curves in the C planes, which are usually documented in polar coordinates. These show the luminous intensity values under standardized operating conditions of the luminaire (e.g. operating position, ambient temperature 25°C). They are related to 1,000 lumens of the illuminants operated in the luminaire and are given in the unit cd / klm (candela per kilolumen). Each C-plane is described by an angle in the horizontal plane, i.e. perpendicular to the vertical C- plane. In the present case, preferably, the Co-180 plane defines or limits a preferably semicircular lighting side of the luminaire facing the road or road side to be illuminated. The C0-C180 plane may extend in parallel or in the main direction of the road and / or road side, thereby ensuring a uniform lighting of the road along an almost complete semi-circular illumination of the road side by the luminaire.

[0022] In other words, particularly, the lighting device is configured to light merely the front side or area directly facing the road, as defined or limited by the C0-C180 plane and / or by every C plane in between the Co and C180, while avoiding any lighting in the rear side or area of the Co-180 plane or the luminaire. Any lighting at the rear area or side of the luminaire is thus prevented or at least minimized. While the Co-180 plane extends in or in parallel to the road or the road side, the C90- 270 plane is oblique, particularly perpendicular, to the main direction of the road or the road side and / or the C0-C180 plane.

[0023] In addition, the luminaire can also prevent undesired uplight via a top-side light shielding and / or by means of the cut-off element, being configured and / or arranged to cut-off, i.e. to shield, substantially any light at a beam or gamma angle y of more than 110 degrees. The gamma angle y is defined with reference to the vertical axis of the luminaire, e.g. the main extension of the light source and / or the light emission direction. Thus, the gamma angle y is zero in the direction of the vertical axis, i.e. in the direction vertically facing the road side, and 90 degrees in the direction perpendicular to the vertical axis of the luminaire or the lighting direction of the light source, i.e. parallel to the road or the road side.

[0024] Thus, the cut-off element can avoid undesired uplight, for example at a gamma angle y of more than 90 degrees, too degrees or 110 degrees, thereby avoiding unwanted glare of the driver in the field of sight and any discomfort or danger associated therewith.

[0025] As mentioned, the cut-off element may - alternatively or additionally - be arranged and / or designed such that an upward light ratio (ULR) of the luminaire is ULR < 6%, preferably ULR < 5% or ULR < 4% or ULR < 3% or ULR < 2% or ULR < 1.0% or ULR < 0.8% or ULR < 0.5% or less.

[0026] Thus, the cut-off element can avoid undesired uplight, for example by limiting the proportion of the luminous flux of the luminaire that is emitted at and above the horizontal, when the luminaire is mounted in its intended installed position / orientation, thereby avoiding unwanted glare of the driver in the field of sight and any discomfort or danger associated therewith. Thus, the luminaire enables an efficient and compact construction for lighting a road, while still providing a sufficient and uniform lighting of the road. In other words, particularly, the luminaire produces an optimal photometry for the intended application of illuminating traffic roads.

[0027] As such, the luminaire is suitable for road lighting installations with reduced height, like bollards or stirrup lighting devices, thereby providing road lighting solutions with improved installation and maintenance. Thus, the luminaire can be implemented in road lighting systems at reduced effort and costs. In other words, particularly, the luminaire may be configured for arrangement below the field of vision of the driver, thereby avoiding discomfort of direct glare and providing improved or optimized conditions to increase luminance of the road.

[0028] Preferably, the optical lighting device is designed such that a light intensity at any C-plane or at least between the C40 and C140 planes or at least between the C30 and C150 planes or between the C20 and C160 planes or between the C10 and C170 planes at the road side has a maximum peak at a gamma angle y in a range between 80 and 90 degrees, preferably between 82 to 88 degrees, more preferred at 84 degrees or at 85 degrees. Thus, the luminaire ensures a wide distribution of light intensity between of wide range of C-planes and a uniform and reliable lighting of the road, even under severe conditions, e.g. foggy or rainy weather conditions.

[0029] In particular, the light intensity at the maximum peak is at least 900 cd / klm or at least 950 cd / klm or at least 1,000 cd / klm or at least 1,050 cd / klm. Thus, the luminaire obtains an efficient lighting which may fulfill official lighting requirements or safety standards, e.g. as set out in EN 13201.

[0030] The luminaire may be designed such that a light intensity is maximum at a Cmax plane in a range between the C10-C170 plane and the C50-C130 plane or between the C20-C160 plane and the C40- C140 plane or being the C30-C150 plane.

[0031] The luminaire may be designed such that a light intensity is maximum at a Cmax plane in a range between the C10 plane and the C50 plane, or between the C20 plane and the C40 plane, or between the C10 and the C40 plane, or between the C20 and the C30 plane, or at the C30 plane.

[0032] Alternatively or additionally, the luminaire may be designed such that a light intensity is maximum at a Cmax plane in a range between the C130 plane and the C170 plane, or between the C140 plane and the C160 plane, or between the C140 and the C170 plane, or between the C150 and the C160 plane, or at the C150 plane. In particular, the light intensity at the Cmax plane is at least 1,000 cd / klm or at least 1,100 cd / klm or at least 1,200 cd / klm or at least 1,300 cd / klm or at least 1,325 cd / klm or at least 1,350 cd / klm. Thus, a homogenous and uniform lighting over a wide range is achieved.

[0033] Preferably, the proportion of light emitted to the road side is more than 85% or more than 90% or more than 95% or more than 97% or more than 98% or more than 99% of the total light output, and preferably less than 100% or less than 99%. Thus, nearly all of the proportion of light emitted is used for the intended purpose, i.e. for lighting the road in an efficient or uniform manner.

[0034] The cut-off element may be arranged and / or designed to cut-off substantially any light at a gamma angle y of more than 110 degrees or more than 100 degrees or more than 95 degrees or more than 92 degrees or more than 90 degrees. In a preferred embodiment, the cut-off element is arranged and / or designed to limit drastically the light intensity starting at a gamma angle y of 88 degrees, so that it may compensate a misalignment or tilt angle on the field. Alternatively or additionally, the cut-off element may be arranged and / or designed such that an upward light ratio (ULR) of the luminaire is ULR < 6%, preferably ULR < 5% or ULR < 4% or ULR < 3% or ULR < 2% or ULR < 1.0% or ULR < 0.8% or ULR < 0.5% or less. Thus, preferably, essentially all or at least a major part of the uplight, i.e. at an angle of more than 90 degrees, can be avoided, thereby avoiding any discomfort of direct glare or directing the lighting proportion efficiently to the road side.

[0035] In particular, the optical lighting device, preferably at least the reflector, is designed such that the light distribution is symmetrical with respect to the C90-C270 plane. Thus, effective light distribution for road lighting is achieved along the road, using the C90-C270 as the main axis for light distribution, in particular in connection with the light source being vertically aligned with or arranged within the C90-C270 plane. Thus, the reflector preferably has a symmetrical shape relative or with respect to a symmetry plane, wherein the symmetry plane is defined by the C90- C270 plane.

[0036] The reflector, preferably the reflector surface, may have a saddle-like shape. In particular, the light source is arranged to have a vertically downward main light emission direction. In particular, the light source is positioned at the C90-C270 plane. This provides an efficient and simple arrangement of the luminaire, using the C90-C270 plane as the center of light distribution for the light emitted from the light source and being arranged in a targeted manner with respect to the C90-C270 plane. It may expedient that the reflector is arranged at least partially arranged below the light source. For a particularly uniform, i.e. preferably intensive and controlled, light distribution, the reflector surface may be designed for specular reflection of the light.

[0037] The reflector surface may have a reflector section, particularly two or more reflector sections. The reflector section maybe concave, e.g. the two or more reflector section maybe formed symmetrically with respect to a symmetry axis. The symmetry axis may be vertically aligned with respect to the light source and / or may be arranged in the C90-C270 plane. The reflector and / or the reflector surface(s) may taper radially with respect to the vertical axis in a curved and / or semicircular end section.

[0038] The luminaire, for example the optical lighting device, the reflector and / or the cut-off element, particularly a shield section of the cut-off element, may at least partially have a white surface and / or a black surface, particularly at least in a section. The color of the respective surface can affect the ULR. The color of the respective surface may be achieved from the choice of material of the corresponding part and / or by means of a surface coating of the corresponding part. Particularly, in case of the white surface, it may be achieved that the upward light ratio (ULR) of the luminaire is ULR < 6%, preferably ULR < 5% or ULR < 4% or ULR < 3% or ULR < 2% or less. Particularly, in case of the black surface, it may be achieved that the upward light ratio (ULR) of the luminaire is ULR < 1.0% or ULR < 0.8% or ULR < 0.5% or less.

[0039] Preferably, the light source comprises or is a light-emitting diode (LED) light source, preferably an LED module comprising a Chip-on-board (COB) LED, an LED array and / or an LED matrix.

[0040] In particular, the light source has a power rating substantially equal to and / or of less than 60W or 50W or 40W or 30W or 25W or 15 W or even less (e.g. with or without dimming). For example, the light source may be configured to be dimmed to provide at least two different power ratings, e.g. 15 W ± 10 %, 30 W ± 10 %, and optionally 40 W ± 10 %. Compared to other approaches in the technical field of road lighting, in particular with reduced height, the luminaire uses less powerful light sources due to the improved efficiency of the lighting concept, in particular due to the targeted interaction between the lighting source and the reflector and cut-off element.

[0041] The luminaire can preferably have a luminous flux of less than 5,ooolm or less than 4,ooolm or less than 3,3001m or less than 3,ooolm or less than 2,5oolm or of 2,3oolm, and / or preferably more than 8oolm or more than i,ooolm or more than i,2oolm or more than i,5oolm or more than 2,ooolm (e.g. with or without dimming). For example, the luminaire maybe configured to be dimmed to provide at least two different luminous flux values, e.g. tooolm ± to %, 25001m ± to %, and optionally 33oolm ± to %. Thus, compared to other approaches of road lighting, in particular at reduced height, an efficient and uniform lighting can be achieved at reduced flux.

[0042] The luminaire may comprise a mounting body for mounting the luminaire at a place of operation, e.g. a road side. The optical lighting device may be arranged at the mounting body at a vertical height of less than 1 m or less than 0.95 m or less than 0.9 m or less than 0.85 m or less than 0.8 m or less than 0.75 m or less than 0.7 m or preferably between 0.7 and 0.9m. The mounting body may have a mounting section, e.g. a horizontal mounting section preferably facing horizontally. The lighting device and / or the cut-off element may overlap with over may be overlapped by the mounting section. The horizontal mounting section may alternatively or additionally to the cut-off element prevent undesired uplight. The mounting body may be elongated and / or shaped as a bollard.

[0043] Preferably, the mounting body may comprise an upper end and a lower end. Preferably, the optical lighting device is arranged at the upper end of the mounting body. This provides a compact and resource saving structure.

[0044] The invention is particularly efficient in combination with a plurality of the luminaires arranged in preferably constant distances along the road side to be illuminated, analogous to columns with several meters height, as outlined herein.

[0045] A preferred application provides a plurality of luminaires with mounting bodies or bollards being arranged at a row of 0,9 m or less bollards at a road width of 8 m, and an interdistance of 15 m. A second version at a lower height of 0,7 m or less can comply to smaller road geometries but would strongly limit the risk of discomfort.

[0046] Two rows of bollard in opposite sides of the road, each facing a respective road side to be illuminated allow compliance or illumination to twice larger roads.

[0047] As an alternative to bollards or a mounting body, the luminaire may also be configured as a stirrup or having a stirrup section for fixing the lighting device at any height, in particular in between 0,7 and 0,9 m. The light source may be provided at a flat section and / or at an underside of the cut-off element. Thus, a compact and easy arrangement is provided. Further, the reflector, preferably the reflector surface, may extend in a curved shape beneath the cut-off element and / or the underside of the cut-off element, in particular at least at the C90-C270 plane. In particular, the reflector and / or the reflector surface tapers or taper at a plane perpendicular to the C0-C180 plane into a curved, preferably semi-circular, end section. The reflector may be shaped convex on the underside. Preferably, for cutting of light in the sense outlined above, the cut-off element has a curved and / or semi-circular shield section extending, preferably from the underside of the cut-off element, towards the reflector.

[0048] The shield section can at least partially surround the light source, preferably wherein the shield section extends in a range at least between the C40 and C140 planes or at least between the C30 and C150 planes or between the C20 and C160 planes or between the C10 and C170 planes. Thus, a targeted and uniform light distribution is ensured along a wide range of the road side to be illuminated.

[0049] The light source may be held at the cut-off element, preferably at the underside, via a holding element. Preferably, the holding element has a particularly circular light emitting opening for the light source. The light source may emit light through the light emitting opening. This provides a compact and efficient construction. The light source may be easily accessible and easy to replace or repair.

[0050] The holding element may be at least partially accommodated in a recess of the reflector. The recess may face upwards. Thus, a compact and space saving arrangement can be achieved.

[0051] The luminaire may comprise an at least partially transparent light emitting cover. The optical lighting device can be covered by the light emitting cover. The light emitting cover may extend around the curved shield section and / or below the reflector. The light emitting cover may extend at least between the C40 and C140 planes or at least between the C30 and C150 planes or between the C20 and C160 planes or between the C10 and C170 planes, preferably between the Co and C180 planes, with respect to a road side.

[0052] Further embodiments and advantages of the present invention are described with reference to the figures of the accompanying drawings. It shows:

[0053] Fig. 1 a luminaire for lighting a road in a perspective view;

[0054] Fig. 2 the luminaire of Fig. 1 in an exploded view; Fig. 3 the luminaire of Fig. 1 with reference to a road to be lightened in a perspective view;

[0055] Fig. 4 the polar distribution of the luminaire of Fig. 1 at different C-planes shown as a diagram;

[0056] Fig. 5 the cartesian distribution of the luminaire of Fig. 1 at different C-planes shown as a diagram;

[0057] Fig. 6 a luminaire for lighting a road as a bollard version in a perspective view; and

[0058] Fig. 7 a luminaire for lighting a road as a stirrup version in a perspective view.

[0059] In the figures, corresponding elements or features have the same reference signs.

[0060] Fig. 1 shows a luminaire 1 for lighting a road (e.g. the road 2 of Fig. 2), comprising a light source 34 and an optical lighting device 20. The optical lighting device 20 comprises a cut-off element 30 and a reflector 40, wherein the reflector 40 has a reflector surface 42 for reflecting light emitted from the light source 34. The light source 34 is an LED light source, preferably an LED module. The light source 34 has a power rating of less than 60W. The reflector 40 maybe a freeform reflector and / or 3D engineered and / or not extruded or not revolved.

[0061] The reflector 40 and / or the reflector surface 42 is / are arranged at least partially below the light source 34, preferably wherein the reflector surface 42 is designed for specular reflection of the light emitted from the light source 34. The light source 34 is arranged to have a vertically downward main light emission direction. The light source 34 preferably defines the origin of the tri-axis geometry reference for the C-planes. Here, the light source 34 is provided at a flat section and / or at an underside 32 of the cut-off element 30.

[0062] The reflector 40, preferably the reflector surface 42, extends at least at the C90-C270 plane or at least between the C30-C150 planes, in a curved shape beneath the cut-off element 30 or the underside 32 of the cut-off element 30. The cut-off element 30 has a curved and / or semi-circular shield section 36 extending from the underside 32 towards the reflector 40 and / or towards the reflector surface 42. The shield section 36 surrounds the light source 34. Here, the shield section 36 extends in a range at least between the C10 and C170 planes. With reference to Fig. 2, the reflector 40, preferably the reflector surface 42, has a saddle-like shape. The reflector 40 can be arranged at least partially below the light source 34, wherein the reflector surface 42 is designed for specular reflection of the light. The optical lighting device 20 or at least the reflector 40 is designed such that the light distribution is symmetrical with respect to the C90-C270 plane. In this embodiment, the reflector 40 has a plane symmetrical shape relative to a symmetry plane, wherein the symmetry plane is defined by the C90-C270 plane.

[0063] The reflector surface 42 has two concave reflector sections 46, wherein the concave reflector sections 46 are formed symmetrically with respect to a symmetry axis 54, preferably wherein the symmetry axis 54 is vertically aligned with respect to the light source 34 and / or is arranged in the C90-270 plane. The reflector 40 and / or the reflector surface 42 may taper radially with respect to a vertical axis defined by the C90-C270 plane in a curved and / or semi-circular end section.

[0064] The specular reflector 40 and / or the semi-circular end section is or are formed convex on its or their underside 32. Preferably, the light source 34 is held at the underside 32 via a holding element 38, wherein the holding element 38 has a preferably circular light emitting opening 48 for the light source 34. The holding element 38 is at least partially accommodated in a recess 50 of the reflector 40, cf. Fig. 2.

[0065] Here, the cut-off element 30 is placed with its underside 32 onto the reflector 40, preferably wherein, in the assembled state (cf. Fig. 1), the shield section 36 laterally overlaps the reflector 40 and / or the reflector surface 42. The optical lighting device 20 is designed such that the light of the light source 34 is emitted to the road 2 mainly to a road side of the luminaire 1, which road side is defined and / or limited by a C0-C180 plane and particularly defined by and / or included in every C plane in between the C0-C180 plane, cf. Fig. 3. The road side is defined and / or (de)limited by the C0-C180 plane, extending in the direction of the road 2, while the C90-270 plane extends perpendicular the main extension of the road 2 and / or perpendicular to the C0-C180 plane.

[0066] Generally, the proportion of light emitted to the road side maybe more than 85% or more than 90% or more than 95% or more than 97% or more than 98% or more than 99% of the total light output, and preferably less than 100% or less than 99% of the total light output of the luminaire 1.

[0067] Furthermore, the cut-off element 30 can be arranged and / or designed to cut-off substantially any light at a gamma angle y of more than 110 degrees, for example as illustrated in the polar diagram of according to Fig. 4. The cut-off element 30 is particularly arranged and / or designed to cut-off substantially any light at a gamma angle y of more than 90 degrees or more than too degrees or more than 110 degrees, for example as illustrated in the polar diagram according to Fig. 4.

[0068] As shown in Fig. 3, the gamma angle y starts from a vertical axis, e.g. where all C-planes intersect, particularly at the luminaire 1. For example, the gamma angle y is 90° considering a horizontal direction, e.g. in parallel to the surface of the road 2 or road side.

[0069] The cut-off element 30 may be arranged and / or designed such that the upward light ratio ULR of the luminaire 1 is ULR < 6% or ULR < 5% or ULR < 4% or ULR < 3% or ULR < 2% or ULR < 1.0% or ULR < 0.8% or ULR < 0.5% or less.

[0070] The luminaire 1, namely at least the cut-off element 30, may have a white surface and / or a black surface at least in a section. The luminaire 1 may have a black surface at least in a section in order to achieve an even lower ULR, e.g. ULR < 1% or ULR < 0.8% or ULR < 0.5% or less.

[0071] The optical lighting device 20 can be designed such that a light intensity at any C-plane or at least between the C40 and C140 planes or at least between the C30 and C150 planes or between the C20 and C160 planes or between the C10 and C170 planes at the road side has a maximum peak at a gamma angle y in a range between 80 and 90 degrees.

[0072] With reference to Fig. 5, the optical lighting device 20 is designed such that a light intensity at least between the C30 and C150 planes has a maximum peak at a gamma angle y of 84 degrees.

[0073] Alternatively or additionally, it is possible that the optical lighting device 20 is designed such that a light intensity at least between the C30 and C150 planes has a maximum peak at a gamma angle y of 85 degrees. The light intensity at the maximum peak is at least 900 cd / klm or at least 950 cd / klm or at least 1,000 cd / klm or at least 1,050 cd / klm.

[0074] In particular, the luminaire is designed such that a light intensity is maximum at a Cmax plane in a range between the C30-C150 plane, wherein the light intensity at the Cmax plane is at least 1,350 cd / klm, cf. Fig. 5.

[0075] The light intensity is maximum at the C30 plane, cf. Figs. 4 and 5.

[0076] The luminaire 1 has a luminous flux of less than 5,000 Im. The beam or the light emission is wide in both directions - transversal, longitudinal - and also optimized for a good uniformity of luminance from a driver point of view. A light distribution is provided having a very high peak of at least 900 cd / klm, particularly at least 950 cd / klm or at least or more than 1000 cd / klm at a gamma angle y of 84° or 85° in most C-planes of the road side, and also a very sharp cut-off before a gamma angle y of 90° to avoid substantially any uplight that could be seen above a height of preferably im or 0.9m by the driver or a pedestrian.

[0077] In Fig. 6 a luminaire 1 with a mounting body 10 is shown, wherein the optical lighting device 20 is arranged at the mounting body 10 at a vertical height of less than 1 m. Alternatively, it is possible that the vertical height is less than 0.95m or less than 0.9m or less than 0.85m or less than 0.8m or less than 0.75m or less than 0.7m.

[0078] The optical lighting device 20 is optionally held at two mounting bodies 10 of different height at either 0.7 m or 0.9 m. Preferably, the mounting body 10 is elongated and / or shaped as a bollard and / or comprises an upper end 12 and a lower end 14. Preferably, the optical lighting device 20 is and / or arranged at the upper end 12 of the mounting body 10.

[0079] The optical lighting device 20 is arranged at a horizontal mounting section 16 of the mounting body 10. Preferably, the lighting device 20 and / or the cut-off element 30 is or are overlapped by the mounting section 16. The horizontal mounting section 16 may also or in addition to the cut-off element 30 prevent undesired uplight.

[0080] Fig. 7 shows a luminaire 1 as a stirrup und / or a stirrup version. The luminaire 1 comprises a stirrup section 18 for mounting the optical lighting device 20 at a height between 0.7 to 0.9 m. The luminaire 1 of Fig. 7 is particularly suitable for tunnel or bridge installations or the like.

[0081] In Fig. 6 and 7, the optical lighting device 20 is covered by an at least partially transparent light emitting cover 52, wherein the light emitting cover 52 extends around the curved shield section 36 and / or below the reflector 40. The light emitting cover 52 extends between the Co and C180 planes with respect to a road side in front of the luminaire 1.

[0082] The shown cut-off elements 30 are made of a light reflective or light absorbing material. A reflective material may contribute to a better visual appearance and esthetics, while an absorbing material may be suitable for further improving glare reduction and uplight control. Reference signs list

[0083] 1 luminaire

[0084] 2 road

[0085] 10 mounting body

[0086] 12 upper end

[0087] 14 lower end

[0088] 16 mounting section

[0089] 20 lighting device

[0090] 30 cut-off element

[0091] 32 underside

[0092] 34 light source

[0093] 36 shield section

[0094] 38 holding element

[0095] 40 reflector

[0096] 42 reflector surface

[0097] 46 reflector sections

[0098] 48 light emitting opening

[0099] 50 recess

[0100] 52 light emitting cover

[0101] 54 symmetry axis

[0102] Y gamma angle

Claims

Claims:

1. Luminaire (1) for lighting a road (2), comprising:• a light source (34), and• an optical lighting device (20) comprising a reflector (40) having a reflector surface (42) for reflecting light emitted from the light source (34), and comprising a cut-off element (30), wherein the optical lighting device (20) is designed such that the light of the light source (34) is emitted mainly to a road side of the luminaire (1) defined by a C0-C180 plane, and wherein the cut-off element (30) is arranged and / or designed• such that an upward light ratio (ULR) of the luminaire (1) is: ULR < 6%, and / or• to cut-off substantially any light at a gamma angle y of more than 110 degrees.

2. Luminaire (1) according to the preceding claim, wherein the optical lighting device (20) is designed such that a light intensity at any C-plane or at least between the C40 and C140 planes or at least between the C30 and C150 planes or between the C20 and C160 planes or between the C10 and C170 planes at the road side has a maximum peak at a gamma angle y in a range between 80 and 90 degrees, preferably between 82 to 88 degrees, more preferred at 84 degrees or at 85 degrees.

3. Luminaire (1) according to the preceding claim, wherein the light intensity at the maximum peak is at least 900 cd / klm or at least 950 cd / klm or at least 1,000 cd / klm or at least 1,050 cd / klm.

4. Luminaire (1) according to any one of the preceding claims, wherein the luminaire (1) is designed such that a light intensity is maximum at a Cmax plane in a range between the C10-C170 plane and the C50-C130 plane or between the C20-C160 plane and the C40-C140 plane or being the C30-C150 plane, and / or wherein the luminaire (1) is designed such that a light intensity is maximum at a Cmax plane in a range between the C10 plane and the C50 plane, or between the C20 plane and the C40 plane, or at C30 plane, and / or wherein the luminaire (1) is designed such that a light intensity is maximum at a Cmax plane in a range between the C130 plane and the C170 plane, or between the C140 plane and the C160 plane, or at the C150 plane,wherein preferably the light intensity at the Cmax plane is at least 1,000 cd / klm or at least 1,100 cd / klm or at least 1,200 cd / klm or at least 1,300 cd / klm or at least 1,325 cd / klm or at least 1,350 cd / klm.

5. Luminaire (1) according to any one of the preceding claims, wherein the proportion of light emitted to the road side is more than 85% or more than 90% or more than 95% or more than 97% or more than 98% or more than 99% of the total light output, and preferably less than 100% or less than 99%, and / or wherein the cut-off element (30) is arranged and / or designed to cut-off substantially any light at a gamma angle y of more than 110 degrees or more than 100 degrees or more than 95 degrees or more than 92 degrees or more than 90 degrees, and / or wherein the cut-off element (30) is arranged and / or designed such that an upward light ratio (ULR) of the luminaire (1) is: ULR < 6% or ULR < 5% or ULR < 4% or ULR < 3% or ULR < 2% or ULR < 1.0% or ULR < 0.8% or ULR < 0.5% or less.

6. Luminaire (1) according to any one of the preceding claims, wherein the optical lighting device (20), preferably at least the reflector (40), is designed such that the light distribution is symmetrical with respect to the C90-C270 plane and / or wherein the reflector (40) has a plane symmetrical shape relative to a symmetry plane, wherein the symmetry plane is defined by the C90-C270 plane.

7. Luminaire (1) according to any one of the preceding claims, wherein the reflector (40), preferably the reflector surface (42), has a saddle-like shape and / or wherein the light source (34) is arranged to have a vertically downward main light emission direction and / or wherein the light source (34) is positioned at the C90-C270 plane.

8. Luminaire (1) according to any one of the preceding claims, wherein the reflector (40) is arranged at least partially below the light source (34) and / or wherein the reflector surface (42) is designed for specular reflection of the light.

9. Luminaire (1) according to any one of the preceding claims, wherein the light source (34) is an LED light source, preferably an LED module comprising a Chip-on-board (COB) LED, an LED array and / or an LED matrix, and / or wherein the light source (34) has a power rating of less than 60W or 50W or 40W or 30W or 25W or 15 W, and / or wherein the light source is configured to be dimmed.

10. Luminaire (1) according to any one of the preceding claims, wherein the luminaire has a luminous flux of less than 5,ooolm or less than 3,3oolm or less than 4,ooolm or less than 3,ooolm or less than 2,5oolm or of 2,3oolm, and / or more than 8oolm or more than i,ooolm or more than i,2oolm or more than i,5oolm or more than 2,ooolm.

11. Luminaire (1) according to any one of the preceding claims, further comprising a mounting body (io) for mounting the luminaire (1) at a place of operation, wherein the optical lighting device (20) is arranged at the mounting body (10) at a vertical height of less than 1 m or less than 0.95m or less than 0.9m or less than 0.85m or less than 0.8m or less than 0.75m or less than 0.7m or preferably between 0.7 and 0.9 m and / or wherein the mounting body (10) is elongated and / or shaped as a bollard.

12. Luminaire (1) according to any one of the preceding claims, wherein the light source (34) is provided at a flat section and / or at an underside (32) of the cut-off element (30) and / or wherein the reflector (40), preferably the reflector surface (42), extends at the C90-C270 plane in a curved shape beneath the cut-off element (30) and / or the underside (32).

13. Luminaire (1) according to any one of the preceding claims, wherein the reflector (40) and / or the reflector surface (42) tapers at a plane perpendicular to the C0-C180 plane into a curved, preferably semi-circular, end section and / or wherein the reflector (40) is shaped convex on the underside.

14. Luminaire (1) according to any one of the preceding claims, wherein the cut-off element (30) has a curved and / or semi-circular shield section (36) extending, preferably from the underside (32), towards the reflector (40) and / or at least partially surrounding the light source (34), preferably wherein the shield section (36) extends in a range at least between the C40 and C140 planes or at least between the C30 and C150 planes or between the C20 and C160 planes or between the C10 and C170 planes at the road side.

15. Luminaire (1) according to any one of the preceding claims, wherein the light source (34) is held at the cut-off element (30), preferably at the underside (32), via a holding element (38), wherein the holding element (38) has a preferably circular light emitting opening (48) for the light source (34) and / or wherein the holding element (38) is at least partially accommodated in a recess (50) of the reflector (40).

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