Disclosed is a light guide mat (1) for the production of a block- or cuboid-shaped light guide body (21), which mat is arranged in a casting mold and can be sealed in a pourable, curable casting compound (24), wherein the light guide mat (1) consists of longitudinal and transverse struts (2, 3) connected to one another in the form of a grid, which struts consist at least partially of a light-conducting plastic, wherein profiled light guide elements (4) consisting of an at least partially light-conducting plastic are integrally formed at the point of intersection of the longitudinal and transverse struts (2, 3), an end face (6) of which elements being formed as light-emitting surfaces on the upper face (22) of the light guide body (21), wherein at least the longitudinal struts (2) of the light guide mat (1) are formed as light channels (5) for receiving point-like, light-generating elements, and the light channels (5) are integrally formed on the face of the light guide elements (4) near to the bottom.