A light guide, comprising a first main surface, which extends in a longitudinal direction "X" and is configured to extract light beams from the light guide, a second main surface, opposite from the first main surface, and at least one side surface, arranged between the first main surface and the second main surface, wherein the at least one side surface is configured to receive the light beams generated by at least one light emitter and transmit them through the inside of the light guide as an effect of internal reflection; the light guide comprising: - a plurality of optics (3a', 3b', 3c') arranged distributed along the second main surface of the light guide, each optic spaced with respect to the following optic by a distance Dx i in the longitudinal direction "X", wherein each optic has a triangular or pyramidal geometry, and wherein the plurality of optics is configured to extract from the light guide through the first main surface by reflecting the light beams which are transmitted through the inside of the light guide in a practically longitudinal direction comprised between an angle of -30° and 30° with respect to the longitudinal direction "X", - a plurality of surface engravings interspersed between the plurality of optics (3a', 3b', 3c') along the longitudinal direction "X", each engraving formed by a roughness made on the surface itself of the second main surface of the light guide, wherein said roughness comprises a height H r less than the height H o of the plurality of optics (3a', 3b', 3c') wherein the heights (H r, H o) are measured in a direction "Z" for light extraction from the light guide, wherein each surface engraving is arranged spaced from the next surface engraving by a distance dx i in the longitudinal direction "X", the plurality of surface engravings is configured to extract from the light guide the light beams which are transmitted through the inside of the light guide in a direction substantially not parallel to the second main surface and in an oblique direction with respect to the longitudinal direction "X" between the two bands: [-90°; -30°] and [30°; 90°] with respect to the longitudinal direction "X" by the reflection of the light beams on the surface engravings. - a plurality of optics (3a', 3b', 3c') arranged distributed along the second main surface of the light guide, each optic spaced with respect to the following optic by a distance Dx i in the longitudinal direction "X", wherein each optic has a triangular or pyramidal geometry, and wherein the plurality of optics is configured to extract from the light guide through the first main surface by reflecting the light beams which are transmitted through the inside of the light guide in a practically longitudinal direction comprised between an angle of -30° and 30° with respect to the longitudinal direction "X", - a plurality of surface engravings interspersed between the plurality of optics (3a', 3b', 3c') along the longitudinal direction "X", each engraving formed by a roughness made on the surface itself of the second main surface of the light guide, wherein said roughness comprises a height H r less than the height H o of the plurality of optics (3a', 3b', 3c') wherein the heights (H r, H o) are measured in a direction "Z" for light extraction from the light guide, wherein each surface engraving is arranged spaced from the next surface engraving by a distance dx i in the longitudinal direction "X",