A component of an optical system of an anti-glare lighting fixture for fluorescent light bars comprising the main reflector (3), whose side walls have a shape similar to the sectors of parabola arms, equipped with an auxiliary reflector (1), whose cross-section has a shape similar to a section of a parabola with a vertex, wherein the auxiliary reflector (1) is located on the main reflector (3), and the cross-section of the joined reflectors is similar to a parabola, wherein the auxiliary reflector (1) is equipped with at least four primary mounting springs (2) arranged symmetrically in pairs on its both sides, wherein the main reflector (3) is also equipped with at least four secondary mounting springs (4) arranged in the same manner as the primary mounting springs (1), wherein the primary (2) and secondary (4) mounting springs are located next to each other in shared mounting openings (5) in the walls of profiles (7) whose cross-section has a shape similar to the letter "L", and which are located on the bottom edge of the fixture (6).