Luminaire having at least one optical unit which has: - several straight optical rows which have respectively several lenses adjacent in longitudinal direction of the optical unit and which are arranged next to one another in a transverse direction of the optical unit, - a frame, which extends from a top side of the optical unit in a height direction of the optical unit to a bottom side of the optical unit, and which encloses the lenses of the optical rows in a closed manner in a peripheral direction, - wherein the lenses and the frame are formed integrally in a plastic body which is manufactured in one piece, rectangular, plate-shaped and transparent, wherein the luminaire further has: - at least one carrier frame which at the top side of the optical unit is set into the optical unit such that the frame also encloses the carrier frame in a closed manner in the peripheral direction, - LED illuminants which are arranged such that to each lens is assigned precisely one LED illuminant, - wherein the plastic body is fastened on the carrier frame, wherein - the plastic body has several struts which in the longitudinal direction are distanced from one another and which in each case are arranged between two such optical rows and in the height direction project in the direction of the top side, - the carrier frame has for each strut a through opening, through which the respective strut passes in the height direction, - the strut at a side, facing away from the lenses, of the carrier frame has a head which is broader than the rest of the strut in the transverse direction by means of plastic deformation, which head can no longer be drawn out through the through opening in the height direction. - several straight optical rows which have respectively several lenses adjacent in longitudinal direction of the optical unit and which are arranged next to one another in a transverse direction of the optical unit, - a frame, which extends from a top side of the optical unit in a height direction of the optical unit to a bottom side of the optical unit, and which encloses the lenses of the optical rows in a closed manner in a peripheral direction, - wherein the lenses and the frame are formed integrally in a plastic body which is manufactured in one piece, rectangular, plate-shaped and transparent, - at least one carrier frame which at the top side of the optical unit is set into the optical unit such that the frame also encloses the carrier frame in a closed manner in the peripheral direction, - LED illuminants which are arranged such that to each lens is assigned precisely one LED illuminant, - wherein the plastic body is fastened on the carrier frame, - the plastic body has several struts which in the longitudinal direction are distanced from one another and which in each case are arranged between two such optical rows and in the height direction project in the direction of the top side, - the carrier frame has for each strut a through opening, through which the respective strut passes in the height direction, - the strut at a side, facing away from the lenses, of the carrier frame has a head which is broader than the rest of the strut in the transverse direction by means of plastic deformation, which head can no longer be drawn out through the through opening in the height direction.