Lighting device

A lighting device comprising:

• a cluster of lighting units, each lighting unit comprising a respective LED-based light source and a respective lens arranged in front of the respective light source and adapted to output a respective individual light beam,
• wherein the cluster of lighting units is configured to output a collective light beam formed by a sum of the individual light beams,
• wherein the cluster of lighting units comprises a first peripheral lighting unit and a second peripheral lighting unit arranged at opposite peripheral sides of the cluster, and
• wherein the respective lens of the first and second peripheral lighting units comprises a first lens portion and a second lens portion, wherein the first lens portion is closer to the center axis of the cluster than the second lens portion, and
• wherein the first lens portion has a smaller extension than the second lens portion, therewith adapted to refract a majority of the intensity of the light collected from the respective light source and to shape light collected from the respective light source such that a mean intensity direction of the respective individual light beam is in a direction away from the center axis of the cluster, the cluster of lighting units being configured such that the collective light beam is symmetric with respect to a symmetry plane coinciding with the center axis,
• wherein the cluster of lighting units comprises a first set of peripheral lighting units and a second set of peripheral lighting units arranged along the opposite peripheral sides of the cluster.
• wherein each peripheral lighting unit of the first and second set comprises a respective lens, wherein each lens is adapted to shape light collected from the respective light source such that a mean intensity direction of the respective individual light beam is directed away from the center axis of the cluster, and
• wherein the cluster of lighting units comprises a sub cluster of lighting units, each comprising an LED-based light source arranged in front of a symmetric lens, wherein a spacing between the lens of a peripheral lighting unit and a neighboring symmetric lens of the sub-cluster is less than a spacing between neighboring symmetric lenses of the sub-cluster.