annular; polygonal other than square or rectangular, e.g. for spotlights or for generating an axially symmetrical light beam

Full Title

Planar light sources > comprising a two-dimensional [2D] array of point-like light-generating elements > characterised by the overall shape of the two-dimensional [2D] array > annular; polygonal other than square or rectangular, e.g. for spotlights or for generating an axially symmetrical light beam