stops and reflects any undesirable luminous rays falling thereon application_number US 55214875 A description the primary purpose of this invention is to improve the lighting panel described in my u s pat no 3 794 829 such panel having on its outer or light emissive surface a plurality of refracting domes arranged in orthogonal rows and columns and partially overlapping one another the bases of such domes being of square form the panel of the invention represented in fig1 and 2 also has a plurality of refracting domes on its exterior or lower surface such domes having a profile in axial transversal section equal to that of the domes of the panel represented in fig3 and 4 and described in the mentioned u s pat no 3 794 829 the domes of which are arranged in orthogonal rows and columns and the bases of each dome being in a square form as shown in fig4 in the panel of the aforementioned patent the points 6 39 on the interior or upper panel surface ts coinciding with the lines of intersection mm 39 of the bases of the domes and points such as 5 39 near to points 6 39 when having luminous rays a b c i incident thereon such rays in great part undergo various total internal reflections being lost in the interior of the domes or re emerging through the interior through face of the panel after having undergone large loss of luminous power some of these rays such as a and g are refracted and emerge through the exterior or lower face of the panel and form with the axis of symmetry of the domes angles of between 70 u00b0 and 85 u00b0 this means that in such a panel there is still produced.