Lamp, comprising a planar light guide plate, comprising: - two planar sides (101, 102) which are connected to one another by a circumferential end face, - coupling structures which are provided on the end face and designed to couple light from outside into the light guide plate as a directed beam bundle, the coupling structures each extending as a concave recess between the planar sides (101, 102) at least over part of the entire height of the light guide plate, each of the coupling structures having, when viewed in plan view of one of the planar sides (101, 102), two surfaces or flanks which are angled relative to one and via which the coupled light is coupled in as two beam bundles directed in different directions, the two surfaces or flanks of the coupling structures angled relative to one another being divided into two groups, the surfaces or flanks of a group all being aligned in parallel with one another, and the entirety of the coupling structures having two groups each of the beam bundles directed in the same direction; and - outcoupling structures which are provided on one of the planar sides (101, 102) in order to deflect the light coupled into the light guide plate via the coupling structures in such a way as to couple this light out of the light guide plate via one of the planar sides (101, 102), the outcoupling structures having an elongate shape, the outcoupling structures extending with their longitudinal axis substantially in the planar plane of the light guide plate; and lighting means which are arranged in such a way to couple light into the light guide plate via the coupling structures, the light sources having LEDs, each of the coupling structures being associated with at least one lighting means, and the associated lighting means being arranged in the concave recess of the associated coupling structure, characterized in that the orientation of each of the outcoupling structures is associated with the direction of one of the beam bundles in such a way that they are oriented with their longitudinal axes perpendicular to the direction of the associated beam bundle, and the outcoupling structures being divided into two different groups in each case of the same orientation, and the outcoupling structures of each of the two groups being associated with one of the directions of the two beam bundles. - two planar sides (101, 102) which are connected to one another by a circumferential end face, - coupling structures which are provided on the end face and designed to couple light from outside into the light guide plate as a directed beam bundle, the coupling structures each extending as a concave recess between the planar sides (101, 102) at least over part of the entire height of the light guide plate, each of the coupling structures having, when viewed in plan view of one of the planar sides (101, 102), two surfaces or flanks which are angled relative to one and via which the coupled light is coupled in as two beam bundles directed in different directions, the two surfaces or flanks of the coupling structures angled relative to one another being divided into two groups, the surfaces or flanks of a group all being aligned in parallel with one another, and the entirety of the coupling structures having two groups each of the beam bundles directed in the same direction; and the coupling structures each extending as a concave recess between the planar sides (101, 102) at least over part of the entire height of the light guide plate, each of the coupling structures having, when viewed in plan view of one of the planar sides (101, 102), two surfaces or flanks which are angled relative to one and via which the coupled light is coupled in as two beam bundles directed in different directions, the two surfaces or flanks of the coupling structures angled relative to one another being divided into two groups, the surfaces or flanks of a group all being aligned in parallel with one another, and the entirety of the coupling structures having two groups each of the beam bundles directed in the same direction; and - outcoupling structures which are provided on one of the planar sides (101, 102) in order to deflect the light coupled into the light guide plate via the coupling structures in such a way as to couple this light out of the light guide plate via one of the planar sides (101, 102), the outcoupling structures having an elongate shape, the outcoupling structures extending with their longitudinal axis substantially in the planar plane of the light guide plate; and lighting means which are arranged in such a way to couple light into the light guide plate via the coupling structures, the light sources having LEDs, each of the coupling structures being associated with at least one lighting means, and the associated lighting means being arranged in the concave recess of the associated coupling structure, the outcoupling structures having an elongate shape, the outcoupling structures extending with their longitudinal axis substantially in the planar plane of the light guide plate; and lighting means which are arranged in such a way to couple light into the light guide plate via the coupling structures, the light sources having LEDs, each of the coupling structures being associated with at least one lighting means, and the associated lighting means being arranged in the concave recess of the associated coupling structure,