A lighting fixture appears as a skylight and is referred to as a skylight fixture. First and second light engines of the fixture provide different color points, peak light intensity angles, far-field light distribution characteristics, and/or circadian stimulus values. A skylight fixture may include a sky-resembling assembly and a plurality of sun-resembling assemblies, with dedicated optical assemblies and/or light sources. A lighting fixture may include multiple waveguides that different extraction feature patterns and/or may be sequentially arranged.

A lighting unit includes a first light source to emit first light; and a diffusive body including a first incidence surface that allows the first light to enter, a diffusive part that includes nanoparticles, guides the entered first light and makes the first light be scattered by the nanoparticles into first scattered light, and an emission surface that emits the first scattered light, wherein the first incidence surface is formed on a first edge part of the diffusive body, the first scattered light is emitted from a first region of the emission surface, and a correlated color temperature of the first scattered light is higher than a correlated color temperature of the first light.

The invention concerns an optoelectronic apparatus comprising a light field pattern generating device with at least one light emitting element and at least one imaging optic, and a first sensor device, wherein the first sensor device is configured to determine the position of a body part, in particudefinilar the face, of a user of the optoelectronic apparatus relative to the light field pattern generating device, and wherein the light field pattern generating device is configured to generate at least one light field pattern on the body part of the user that is not directly visible to the user when looking in the direction of the light field pattern generating device, the light field pattern comprising at least a first area with a first illuminance and a second area with a second illuminance smaller than the first illuminance.

A lighting fixture appears as a skylight and is referred to as a skylight fixture. First and second light engines of the fixture provide different color points, peak light intensity angles, far-field light distribution characteristics, and/or circadian stimulus values. A skylight fixture may include a sky-resembling assembly and a plurality of sun-resembling assemblies, with dedicated optical assemblies and/or light sources. A lighting fixture may include multiple waveguides that different extraction feature patterns and/or may be sequentially arranged.

A test device for testing a solar generator of a satellite or solar drone, the solar generator includes an array of solar cells, each junction being capable of converting photons of a respective wavelength band into electric current, the test device includes: an array of light sources including at least one row of light sources, wherein each light source emits light in each of the electrical conversion wavelength bands of the junction(s) of the solar cells, and a control unit for the array of light sources, and capable of controlling the turning on and off of each of the light sources of the array individually, wherein the array of light sources selectively illuminates each solar cell of the solar generator by turning on one or more light sources of the array, with the solar cell receiving an irradiance that is greater than at least 130W/m.sup.2.

The present invention is directed to a chromatic effect light reflective unit (1; 1a-1g). The unit (1; 1a-1g) comprises 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 second surface (23), opposite and substantially parallel to the first, configured to be illuminated by incident light, wherein the chromatic diffusion layer (20) comprises a nano-pillar (70) or nano-pore (30) structure in a first material having a first refractive index (n1), immersed in a second material having a second refractive index (n2) other than the first (n1), in which the first and second materials are substantially non-absorbing or transparent to electromagnetic radiations with wavelength included in the visible spectrum, wherein the ratio (n.sub.M/n.sub.m) between a higher refractive index (n.sub.M) and a lower refractive index (n.sub.M) chosen between the first (n1) and the second (n2) refractive indexes is comprised between 1.05 and 3, wherein the nano- pillars (71) or nano-pores (31) have a development along a main direction not parallel to the first surface (21) and the second surface (23) of the chromatic diffusion layer and the nano- pillars (70) or nano-pores (30) structure is characterized by a plurality of geometric parameters comprising a pillar diameter or pore diameter (d.sub.p), a pillar length or pore length (1.sub.p) along said main development direction, and a surface density of nano-pillars or nano-pores (D.sub.p) and/or a structure (30,70) porosity (P.sub.p) and wherein the pillar diameter or pore diameter (d.sub.p) is comprised between 40 nm and 300 nm, the length (l.sub.p) along the main development direction is comprised between 300 nm and 40 .Math.m (300 nm < l.sub.p < 40 .Math.m) and at least one between the surface density of nano-pillars or nano-pores (D.sub.p) and the structure (30,70) porosity (P.sub.p) is configured to provide a higher regular reflectance for wavelengths of incident light comprised in the range of red with respect to wavelengths of incident light comprised in the range of blue and a higher diffuse reflectance for wavelengths of incident light comprised in the range of blue than wavelengths of incident light comprised in the range of red.

An apparatus for artificial weathering or lightfastness testing of samples or for simulating solar radiation, the apparatus comprises a weathering chamber, an electrodeless lamp provided in the weathering chamber and comprising a bulb filled with a composition that emits light when in a plasma state, and a radio frequency source being arranged so that it radiate a radio frequency field into the bulb to generate a luminous plasma for emitting a radiation comprising spectral emission characteristics similar to natural solar radiation.

An integrated cap for retrofitting an existing light fixture can include an integrated cap housing that is configured to be disposed atop a pole that supports the existing light fixture, where the integrated cap housing includes a communication module and a transceiver. The integrated cap can also include a first coupling feature disposed at a bottom end of the integrated cap housing, where the first coupling feature is configured to couple to a first component of the existing light fixture to provide electrical signals to the communication module and the transceiver, where the communication module and the transceiver communicate with a second component external to the existing light fixture.

A system and method for testing an effect of light exposure on a skin sample include a solar simulator arranged to administer a combination of visible light (VL) and long wavelength ultraviolet radiation (UVA1) to the skin sample. The solar simulator includes a lamp for generating a light beam and at least one customized filter for receiving the light beam and emitting a VL+UVA1 spectral output having a wavelength range of 370-700 nm for irradiating the skin sample.

An optical element, a lighting system, and a LED luminaire simulate natural sunlight for a space, such as an indoor room. The optical element is disposed in front of a tunable white light source and includes unique microstructures, which when used with the tunable white light source, produces an appearance of the sun. The lighting system comprises the optical element, the tunable white light source assembling the sun and a color tunable light emitting panel assembling a sky. The luminaire incudes the lighting system, a driver, and a controlling device for simulating sunny sky scenes throughout the day.