Abstract: A lighting system is for providing photosynthetically stimulating artificial light to a specified target area where such artificial light is needed. The lighting system has at least one luminaire with a light source. The luminaire emits photosynthetically stimulating light at a narrow beam angle of less than and including 20° (FWHM). The lighting system has means for positioning the at least one luminaire at a distance of minimum 20 m from the specified target area measured in a light beam direction, and the luminaire is adapted to illuminate the specified target area with a minimum photosynthetic photon flux density of 140 ?mol/s/m2. A method is for improving the growth conditions for plants in need of light at a specified target area by exposing the plants to a photosynthetically artificial light from a light source.

Abstract: A lighting system is for providing photosynthetically stimulating artificial light to a specified target area where such artificial light is needed. The lighting system has at least one luminaire with a light source. The luminaire emits photosynthetically stimulating light at a narrow beam angle of less than and including 20° (FWHM). The lighting system has means for positioning the at least one luminaire at a distance of minimum 20 m from the specified target area measured in a light beam direction, and the luminaire is adapted to illuminate the specified target area with a minimum photosynthetic photon flux density of 140 ?mol/s/m2. A method is for improving the growth conditions for plants in need of light at a specified target area by exposing the plants to a photosynthetically artificial light from a light source.

Abstract: It is described a fenestration system comprising a window pane provided with a horizontal stripe pattern of solar cells, and window blinds provided with slats operative to concentrate direct sunlight onto said solar cells and operative to redirect diffuse daylight and/or direct sunlight for improved daylight distribution within an interior space. The fenestration system may be provided with control means for automatically adjustment of said window blinds based on a number of parameters like sun position, sky conditions, energy demands, need for daylight within the interior space and need for solar shading.