Abstract: A light reactor for photochemical material production and/or treatment including a receiving space for receiving materials to be irradiated and/or receiving a reaction vessel containing such materials, a plurality of light sources, and a plurality of optical elements, which are distributed in an annular region in a plurality of rows around the receiving space. The optical elements are designed to form light bundles having main emission axes which, from row to row, are tilted differently with respect to a longitudinal axis of the annular region and together form a radiation space constricted between two cone tips, the center of which radiation space is in the central region of the receiving space.

Abstract: A lighting apparatus, in particular in the form of ceiling spots, with a perforated panel having at least one aperture for light to pass through, as well as a lens arranged so as to be concealed behind the perforated panel to emit a bundle of light beams that narrows on its way from the lens to the perforated panel, passes through the aperture for light to pass through, and broadens again after leaving the perforated panel. The lens is shaped in such a manner that a direct beam portion and/or direct light portion emitted without reflection from the lens and an indirect beam portion and/or indirect light portion emitted with reflection from the lens have essentially identical beam angles, and each essentially completely make up and/or fill out the overall bundle of light beams emitted by the lens.

Abstract: A lighting apparatus, in particular in the form of ceiling spots, with a perforated panel having at least one aperture for light to pass through, as well as a lens arranged so as to be concealed behind the perforated panel to emit a bundle of light beams that narrows on its way from the lens to the perforated panel, passes through the aperture for light to pass through, and broadens again after leaving the perforated panel. The lens is shaped in such a manner that a direct beam portion and/or direct light portion emitted without reflection from the lens and an indirect beam portion and/or indirect light portion emitted with reflection from the lens have essentially identical beam angles, and each essentially completely make up and/or fill out the overall bundle of light beams emitted by the lens.