Abstract: An optical film made from a light-permeable material includes a surface and an optical microstructure having a plurality of elevations. The elevations of the microstructure protrude from a reference plane, which is parallel to the surface. The elevations of the microstructure each have a flank section which adjoins the reference plane and forms a uniform angle with the reference plane. The uniform angle is in a range from about 33° to about 42° or in a range from about 35° to about 40°. The optical film according to the invention makes it possible to provide a light fixture with relatively strong glare suppression and at the same time to produce a preferred light distribution curve (LDC). In addition, it can be relatively flexibly moulded and cost-effectively produced.

Abstract: An optical layer made from a light-permeable material includes a surface and an optical microstructure having a plurality of elevations. The elevations of the microstructure protrude from a reference plane, which is parallel to the surface. The elevations of the microstructure each have a flank section which adjoins the reference plane and forms a uniform angle with the reference plane. The uniform angle is in a range from about 10° to about 26° or in a range from about 13° to about 23° or in a range from about 15° to about 20°. The optical layer according to the invention makes it possible for a light fixture to achieve a high light output rate (LOR) at the same time to produce a preferred light distribution curve (LDC).

Abstract: A lighting device has a light source and a light distributor comprising a lamella grid or, more precisely, a reflective lamella grid. This has two strips parallel to one another and a row of lamellae which are arranged between said strips and, together with the two strips, consist of a single sheet-metal piece. Each lamella has a web and one or two limbs associated with this. Each web is furthermore associated with the two strips. The light distributor furthermore has two lateral walls which serve as lateral reflectors and are formed either by lateral sections of the sheet-metal piece forming the reflective lamella grid or by two originally separate parts connected to the reflective lamella grid. The reflective lamella grid can be produced economically from an originally flat sheet-metal piece with little work.