A skylight cover is provided that includes a light transmitting body including first and second integral lenses. The first and second integral lenses define polygonal perimeters, each polygonal perimeter having a first element and a second element residing therein, the first and second elements disposed adjacent to each other in each instance. The skylight cover may include a plurality of ridges and creases, the individual, respective ridges and creases disposed in advantageous configurations. The cover may likewise include a plurality of surfaces, some optionally parallel and some optionally co-planar.

A sunlight-based projector system (3) is disclosed for providing a direct light beam (5). The projector system (3) comprises a sunlight receiving unit (9) with a collector system (13), a plurality of optical fibers (15), and a plurality of fiber output channels (44). The collector system (13) collects natural outdoor light, and couples the collected light into the plurality of optical fibers (15). The projector system (3) comprises further a sunlight forming unit (11) with a plurality of optical collimator units (47) arranged in a two-dimensional array, wherein each optical collimator unit (47) receives the respective fiber output light (45) and comprises at least one optical collimator (49) for reducing the angular distribution width of the received divergent fiber output light (45). Output areas of the plurality of optical collimator units (47) form essentially a continuously extending large light-emitting face (53) of the sunlight forming unit (11) for emitting an essentially collimated light beam (5). The generated direct light beam (5) may be used together with diffused light generating areal units to provide a sun-sky imitating lighting system with a sun-like appearance.

A daylight illumination system for integration into a building or larger vehicle comprises a translucent facade element (800) containing a glass sheet and a light redirection element (302 or 708), and a light transport channel (801) for guiding light about horizontally into an interior of the building, the light transport channel comprising one opening attached to the interior side of said facade element and at least one opening towards the interior of the building, characterised in that the light redirection element (302 or 708) is formed as a structured polymer film or sheet attached to a glass sheet of the facade element (800) and is configured for changing the direction of incident light into the about horizontal light transport channel.

A light source (25) for emitting collimated light (29) in particular for a large area luminaire (21) comprises a light guide unit (43) for guiding light by total internal reflection. The light guide unit comprises a plurality of localized light source regions (57) at a main front face (55A) for having light pass there through. The light source (25) further comprises a plurality of light emitting units (41) for emitting light into the light guide strips (91) through respective portions of the at least one coupling face (47) of the light guide unit (43), and a collimation unit (45) extending along the main front face (55A) and comprising a plurality of collimating elements. At least one light emitting unit (41) is configured as a light input coupling assembly (250) to receive collected natural light from a fiber (249) and to provide the received natural light to the light guide unit (43). The light source (25) can be implemented in a sunlight-based illumination system (241) collecting and providing natural light to the light source (25).

A daylighting panel for integration into a building or larger vehicle comprises a translucent facade element (800) containing a glass sheet and a light transport channel (801) for guiding light about horizontally into an interior of the building, the light transport channel comprising one opening attached to the interior side of said facade element and at least one opening towards the interior of the building equipped with a luminaire (807), characterised in that the inner walls including the rear end are covered by a reflecting layer (808).

A daylighting device according to an aspect of the present invention is a daylighting device for a building construction including an eaves that blocks solar radiation on an outer side of a window. The daylighting device includes a daylighting member and a support member. The daylighting member includes a first base member that is light transmissive, a plurality of daylighting portions that are light transmissive and disposed on a first surface of the first base member, and a gap portion disposed between the plurality of daylighting portions. The support member supports the daylighting member. The daylighting device changes an orientation of light incident thereon and causes the light to emit to a space shaded by the eaves.

An optical device and systems using an optical device are provided, where the optical device may be configured for collimating incoming light rays. The optical device may include a host medium substantially comprised of a transparent material and an array of substantially transparent structures embedded within the host medium. The structures of the array each include a convex side presented to the incoming light rays and a concave side that passes light rays through toward the output face of the host medium, collimating the rays. Multiple stages of arrays may be provided in the optical device, typically with lengthening aspect ratios and increasing indexes of refraction in a direction from the input face toward the output face. The systems may use the optical device for using an exterior light to illuminate an interior space in a building or to generate power.

A daylight illumination system for integration into a building or larger vehicle comprises a translucent facade element (800) containing a glass sheet and a light redirection element (302 or 708), and a light transport channel (801) for guiding light about horizontally into an interior of the building, the light transport channel comprising one opening attached to the interior side of said facade element and at least one opening towards the interior of the building, characterised in that the light redirection element (302 or 708) is formed as a structured polymer film or sheet attached to a glass sheet of the facade element (800) and is configured for changing the direction of incident light into the about horizontal light transport channel.

Non-imaging radiation collecting and concentrating devices, and assemblies, are disclosed. The non-imaging radiation collecting and concentrating devices comprise an entrance aperture for receiving incoming radiation, an exit aperture located opposite to the entrance aperture for outputting concentrated radiation, and one or more concaved reflectors arranged between the entrance and exit apertures. The concaved reflectors define an acceptance angle of the device relative to an optical axis thereof and configured such that their optical focuses are located between edges of the exit aperture and the optical axis, thereby substantially preventing escape of the incoming radiation received in the entrance aperture within the acceptance angle and providing substantial uniform radiation collection at the exit aperture of the device.

A light box is designed to receive sunlight guided through optical-fibers and to divert it through optics onto a photovoltaic chip which converts sunlight into electrical energy. The optics can be arranged as a prism or a reflective surface. The chip is not integrated with the light box.