A lighting device comprising - a laser-diode bar with a plurality of emitters (101, 102, 103) which are arranged adjacently to one another in a first direction and emit sub-beams (10, 11, 12) during operation, said sub-beams having a lower beam divergence in a first direction that forms a slow-axis direction than in a second direction that forms a fast-axis direction and is perpendicular to the first direction, with at least some of the emitters (101, 102, 103) having a height offset in relation to the other emitters (101, 102, 103) so that these emitters (101, 102, 103) do not emit the sub-beams (10, 11, 12) at the height of an optical axis of the laser-diode bar, - a fast-axis collimation means positioned behind the at least one laser-diode bar in a beam-propagation direction perpendicular to the slow-axis direction and to the fast-axis direction, - a beam transformation means positioned behind the fast-axis collimation means in the beam-propagation direction and designed to rotate the sub-beams (10, 11, 12) through 90° as they pass through said means, characterised in that the lighting device comprises a prism array positioned behind the beam transformation means in the beam-propagation direction and comprises a number of prism means (40, 40') corresponding to the number of emitters (101, 102, 103), arranged adjacently to one another in the first direction, each of which has an incident light face (400, 400') and a light output face (401, 401') for one of the sub-beams (10, 11, 12), wherein the incident light faces and/or the light output faces of those prism means pass through by the sub-beams, which have a height offset before the beam rotation via the beam transformation means, being designed in such a way that a Poynting error [mrad] = height error [μm]/focal length [mm] of the fast-axis collimation means is corrected by the parallelisation of such sub-beams, wherein the light output faces of those prism means pass through by the sub-beams, which have a height offset before the beam rotation via the beam transformation means, being formed in a wedge shape in the first direction and wherein those prism means through which the sub-beams (10, 11), which do not have a height offset before the beam rotation via the beam transformation means, pass, have incident light faces and light output faces that are parallel to one another. - a laser-diode bar with a plurality of emitters (101, 102, 103) which are arranged adjacently to one another in a first direction and emit sub-beams (10, 11, 12) during operation, said sub-beams having a lower beam divergence in a first direction that forms a slow-axis direction than in a second direction that forms a fast-axis direction and is perpendicular to the first direction, with at least some of the emitters (101, 102, 103) having a height offset in relation to the other emitters (101, 102, 103) so that these emitters (101, 102, 103) do not emit the sub-beams (10, 11, 12) at the height of an optical axis of the laser-diode bar, - a fast-axis collimation means positioned behind the at least one laser-diode bar in a beam-propagation direction perpendicular to the slow-axis direction and to the fast-axis direction, - a beam transformation means positioned behind the fast-axis collimation means in the beam-propagation direction and designed to rotate the sub-beams (10, 11, 12) through 90° as they pass through said means,