| CPC F21S 8/06 (2013.01) [F21V 3/0625 (2018.02); F21V 7/0016 (2013.01); F21V 17/104 (2013.01)] | 11 Claims |

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1. A lighting luminaire, in particular for a suspended tile light ceiling assembly, the lighting luminaire at least comprising:
an elongated fixture housing comprising an elongated light exit opening; and
an elongated light exit window plate structured to be mounted to the fixture housing for covering the elongated light exit opening, wherein
the elongated light exit opening is bound by two longitudinal mounting slots facing each other, the longitudinal mounting slots each being configured to accommodate a longitudinal plate edge of the elongated light exit window plate, wherein
the elongated light exit window plate has a width larger than a width of the elongated light exit opening, but smaller than a distance between longitudinal mounting slots facing each other, and
the lighting luminaire further comprising a set of two fixating plate elements, each fixating plate element having two longitudinal element edges each structured to be accommodated in one of the two longitudinal mounting slots and a frontal element edge structured to fixate the elongated light exit window plate between the two longitudinal mounting slots through abutment against a frontal plate edge of the elongated light exit window plate
wherein the frontal element edge is further structured to fixate the elongated light exit window plate between the two longitudinal mounting slots through abutment against both longitudinal plate edges of the elongated light exit window plate, and
wherein the fixating plate element has a width larger than the width of the elongated light exit window plate.
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