Abstract: The present invention relates to an optical filter (100) comprising a substantially flat entry surface (101), a substantially flat exit surface (102) parallel to the entry surface, a plurality of channels (103) made of a material substantially transparent to light, wherein the channels (103) of the plurality of channels comprise an entry face (104), an exit face (105) and a lateral surface extending perimetrically between the entry face (104) and the exit face (105) over a length (L) of the channels (103), are arranged side by side and parallel to each other so as to define a plurality of interspaces between adjacent channels (103), have a channel axis (Y) incident to the entry (101) and exit (102) surface, and are arranged with the entry face (104) substantially overlapping the entry surface (101) and with the exit face (105) substantially overlapping the exit surface (102), at least one element of optically absorbing and/or non-transparent material (108, 109; 109?) configured and arranged with respect to th

Abstract: The present invention relates to sunshade units for internal or external cladding of the transparent structures of a building façade comprising a plurality of lamellae (201) each having a substantially flat and elongated conformation along a respective development axis (B), and a structure (220,220?) supporting the lamellae configured to support the plurality of lamellae (201) in a condition of parallel and spaced apart lamellae along a direction orthogonal to the development axes (B), the structure (220,220?) supporting the lamellae being configured to support the plurality of lamellae (201) in a rotatable manner about a rotation axis parallel to or coincident with its development axis (B), characterized in that each lamella (201) of the plurality of lamellae (201) includes at least one surface portion which comprises at least a reflective layer (10) having at least one reflective surface (11), and a chromatic diffusion layer (20) having a first surface (21) proximal to the reflective surface (11) and a seco

Abstract: The present invention relates in general terms to a lighting device to simulate natural lighting, thus capable of generating at least two light components with different angular distributions having different correlated colour temperature or CCT. The lighting device to simulate natural lighting thus conceived is able to generate a light with two chromatic components having different angular distributions, however effectively preventing the light at a higher colour temperature (bluish light) from generating glare effects or from giving the environment an unnatural colouring that the natural light of the sky and the sun would not produce.

Abstract: A polymer matrix/nanoparticle composite (PMNC) comprises core-shell nanoparticles, where the core is made of a material that is different from the polymer matrix and at least part of the shell is made of the same monomer or polymer that is used for said polymer matrix, or is made of a monomer or polymer compatible with said matrix. The core of the nanoparticles has a refractive index that is different from the refractive index of the polymer used for the matrix, at least the matrix is made of transparent materials that do not absorb light.

Abstract: An embodiment of an illumination device comprising a broad band artificial light source and a non-liquid chromatic diffuser transparent to visible light comprising a dispersion of elements of nanometrical dimensions of a first material with of certain refractive index in a second material with different refractive index, wherein the light is scattered producing a separation and different distribution between cold and hot components of the light originally produced by the source, according to a scattering process in “Rayleigh” regime. The device allows illumination effects similar to those of natural outdoor environments to be reproduced in indoor environments.

Abstract: 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).

Abstract: 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).

Abstract: An artificial illumination device for generating natural light similar to that from the sun and the sky includes a direct-light source; and a diffused-light generator, wherein the direct-light source includes a first light-emitting device configured to emit a primary light, and a first emitting surface positioned downstream the first light-emitting device, wherein the diffused-light generator is at least partially light-transparent and is positioned downstream of the first light-emitting device and includes a second emitting surface and is configured to cause diffused light at the second emitting surface. Both co-operate to form outer light at an outer emitting surface which includes a first light component which propagates along directions contained within the narrow peak and a second light component which propagates along directions spaced apart from the narrow peak, and wherein the first light component has a CCT which is lower than a CCT of the second light component.

Abstract: A lighting system for illuminating an environment with a lighting that simulates natural lighting, which includes: a first light source which emits a beam of visible light; a diffused-light generator delimited by an inner surface, which receives the light beam, and an outer surface, the diffused-light generator being at least partially transparent to the light beam. The diffused-light generator transmits at least part of the light beam and emits, through the outer surface, visible diffused light, the correlated color temperature of the transmitted light being lower than the CCT of the visible diffused light. The lighting system includes a dark structure which is optically coupled to the environment via the diffused-light generator and provides a substantially uniform background to the first light source.

Abstract: A chromatic stratified panel structure (100) for generating a sun-sky-imitating effect in lighting systems (1) comprises two cover panels (102, 104) at least one of which being a transparent panel; an adhesive transparent polymeric layer (106) sandwiched between the two inner faces of the two cover panels; and at least one nanoparticle-based Rayleigh-like diffusing coating (108) applied to an inner face of at least one of the two cover panels (102, 104) and/or to a face of the adhesive transparent polymeric layer (106) and forming an interlayer between one of the cover panels (102, 104) and the adhesive transparent polymeric layer (106).

Abstract: In an aspect, a lighting system (1) comprises a lighting unit (11) with a light source (31) and a dichroic light exiting surface (15), wherein the lighting unit (11) is configured for emitting dichroic light from the dichroic light exiting surface (15). The emitted dichroic light includes a directional light portion (37) of direct light (17) and a diffused light portion (39) of diffused light (19) with a another larger correlated color temperature. The lighting system further comprises an appearance affecting optical system (13) with a plurality of structural elements (40, 91, 93, 101, 105) that comprise surfaces that delimit a plurality of diffused light passages (14, 103, 107), and comprise direct light illuminated surface regions (25), which are subject to the illumination with direct light (17) from respectively associated affected direct light providing areas (81) of the dichroic light exiting surface (15).

Abstract: In an aspect, a chromatic facade unit for being attached to a wall (1A) of a building (1) is disclosed that can form a facade (3) of the wall (1A). The chromatic facade unit (11) comprises a support structure (15), a chromatic reflective layer (17) formed on the support structure (15), the chromatic reflective layer (17) comprising reflective layer (43) and a chromatic diffusing layer (41), wherein the chromatic diffusing layer (41) is configured to provide for a specular reflectance that is larger in the red than in the blue and for a diffuse reflectance that is larger in the blue than in the red, and the reflective layer (43) is configured to reflect visible light having passed through the chromatic diffusing layer (41).

Abstract: A light source (25) for emitting collimated light (29) in particular for a large area luminaire (21) comprises a light guide unit (43) comprising a plurality of light guide strips (91) configured for guiding light received at the at least one lateral coupling face (47), for example, by total internal reflection. The light guide strips comprise a plurality of localized light source regions (57) at a main front face (55A) for having light pass there through, wherein the light source regions (57) are provided along the light guide strip (91) within a non-source region (59). The light source (25) further comprising 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), and a collimation unit (45) extending along the main front face (55A) and comprising a plurality of collimating elements.

Abstract: A lighting system (1) for in particular forming a room edge (12) of a room comprises an enlarged sky-perception providing unit (2) with a light transparent panel (3) and a mirror unit (13) with a reflective face (13A) forming an inner edge (14), the lighting system further comprises a light source (41) configured to emit a direct light beam (43) through the light transparent panel (3) onto the mirror unit (13) such that the transmitted portion (9) of the light beam is reflected completely by the reflective face (13A), thereby creating a reflected direct light beam (17) in particular for imitating a sun beam.

Abstract: In an aspect, an illumination system (100) includes a light source (102) configured to generate a light beam (103), and a chromatic reflective unit (1) for being illuminated by the light beam (103). The chromatic reflective unit (1) includes a plurality of non-coplanar reflective surface sections (3?), and a chromatic diffusing layer (5) includes a plurality of nanoparticles (37) embedded in a matrix (39). The chromatic diffusing layer (5) is provided upstream of the plurality of reflective surface sections (3?) such that at least a portion of the light beam (103) passes through the chromatic diffusing layer (5) before and after being reflected by the plurality of non-coplanar reflective surface sections (3?). Chromatic diffusing layer (5) is further configured to provide for a specular reflectance that is larger in the red than in the blue and for a diffuse reflectance that is larger in the blue than in the red.

Abstract: 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).

Abstract: A composite system for light diffusion comprises a matrix of a material that is transparent to light; the matrix contains a dispersion of scattering elements having a core that is a nanocluster of inorganic nanoparticles, and a shell comprising silane compounds and dispersing agents; the nanocluster having average dimensions in the range of 20 nm to 300 nm.

Abstract: 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).

Abstract: A lighting system (100A, 100B) comprises a light source (102) for emitting a light beam stripe (220B) with a plurality of light emitting units (603, 803A, 803B) forming an array in the longitudinal direction (X), and an optical element (870) at the exit side of the light source (102) extending across the plurality of light emitting units, and configured to enlarge the beam divergence in the transversal direction.

Abstract: An embodiment of a solid optical sky-sun diffuser, which comprises a transparent solid matrix embedding a dispersion of transparent nanoparticles having an average size d in the range 10 nm?d?240 nm; wherein: the ratio between the blue and red scattering optical densities ??Log [T(450 nm)]/Log [T(630 nm)] of said diffuser falls in the range 5???2.5, where T(?) is the Monochromatic Normalized Collinear Transmittance; in at least one propagation direction, said Monochromatic Normalized Collinear Transmittance is T(450 nm)?0.4; in at least one propagation direction said Monochromatic Normalized Collinear Transmittance is T(450 nm)?0.9, said propagation direction being the same or different from that at which said Monochromatic Normalized Collinear Transmittance is T(450 mm)?0.4.