Abstract: Known protection devices against solar light have orientable slats of translucent material with, on the inside, a plurality of conical prisms. With such an arrangement, the closure field obtained is more or less circular and, as a consequence, the daylight penetration is unfavorable while it is necessary to provide for an additional orientation during the day. The device according to the invention has, compared to known devices, better transparency characteristics without requiring an adjustment to the orientation during the day and with little adjustment throughout the year. According to the invention, the slats orientable along their horizontal axes are of a simple construction, and are provided on the inner surfaces with prismatic rods parallel to the longitudinal axes and having on the outer surface a flat base face. The surfaces on the sides of the right angle of the prismatic rods are free of reflecting layers and form an angle of 90.degree..

Abstract: A lighting system having a high output lamp constituting an approximately point-shaped light source and a plurality of transparent shells disposed about the high output lamp, each of which shells has a central opening, an inner rim face about the opening and an outer rim face about the periphery of the shell. At least a major portion of the light emitted by the lamp is received by the inner rim faces of the shells and is transmitted by total reflection between the opposite side walls of each of the shells to and out of the outer rim faces of the shells, from which the light emerges.