A solar simulator has an array of light sources including LED light sources and at least one non-LED light source. At least a portion of the infrared-light wavelength range covered by the solar simulator is covered only by the non-LED light source More than 50% of the irradiance provided by the solar simulator is provided by the LED light sources. Application to artificially recreate sunlight in a solar testing device for the testing of solar cells, sun screens, and other products.

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.

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.

A light fixture, e.g., as an artificial skylight, in which light within a region defined by x, y color coordinates (0.37, 0.34), (0.35, 0.38), (0.15, 0.20), and (0.20, 0.14) exits a first light engine, and light within a region defined by coordinates (0.29, 0.32), (0.32, 0.29), (0.41, 0.36), (0.48, 0.39), (0.48, 0.43), (0.40, 0.41), and (0.35, 0.38) exits a second light engine. Also, light fixtures in which a second light engine comprises a sidewall, and light exiting a first light engine passes through space defined by the sidewall; light fixtures in which first and second light engines are able to output light providing different CS values at a luminance; light fixtures in which light incident on a surface of the fixture and cumulative light exiting the fixture have different color points; light fixtures in which light distribution characteristics of light engines differ; and/or other features. The invention also relates to corresponding methods.

There is provided a system for evaluating an ultraviolet-protection product to be applied to skin, including a light source generating an output beam and a spacer mountable to the light source for maintaining a fixed distance between the light source and the skin. The spacer includes a mounting bracket engageable with the light source and a frame mechanically connected to the mounting bracket and extending longitudinally outwardly from the mounting bracket, the frame comprising an outer periphery, an inner periphery and a skin-contacting portion, the inner periphery defining a hollow region therein, such that when the skin-contacting portion is engaged with the skin, the beam passes through the hollow region and interacts with the skin at an illumination plane to define an illuminated area confined within the hollow region, the ultraviolet-protection product remaining substantially unaffected in the illuminated area upon relative movement of the skin with respect to the frame.

An air conditioner includes a housing including an illumination opening at a position viewable by a user; a blower provided in an airflow path connecting an inlet and outlet; a light emitter provided in the housing viewable through the illumination opening and including a light incident portion to receive light emitted from a first light source and a first light emission portion to emit first light generated from the light and including light simulating natural light; and at least one light extractor emitting second light that is part of the light received by the light emitter that reaches an edge portion of the light emitter without being emitted as the first light or second light received from the first light source or a second light source different from the first light source without intervention of the light emitter. The at least one light extractor is provided in the airflow path.

A light fixture, e.g., as an artificial skylight, in which light within a region defined by x, y color coordinates (0.37, 0.34), (0.35, 0.38), (0.15, 0.20), and (0.20, 0.14) exits a first light engine, and light within a region defined by coordinates (0.29, 0.32), (0.32, 0.29), (0.41, 0.36), (0.48, 0.39), (0.48, 0.43), (0.40, 0.41), and (0.35, 0.38) exits a second light engine. Also, light fixtures in which a second light engine comprises a sidewall, and light exiting a first light engine passes through space defined by the sidewall; light fixtures in which first and second light engines are able to output light providing different CS values at a luminance; light fixtures in which light incident on a surface of the fixture and cumulative light exiting the fixture have different color points; light fixtures in which light distribution characteristics of light engines differ; and/or other features. The invention also relates to corresponding methods.

A process for providing a desired environment in an indoor space includes providing light from one or more light sources suitable for meeting a set of general illumination parameters and dynamically adjusting the light from the one or more light sources based on a set of simulated environment illumination parameters while maintaining the light within the general illumination parameters. By dynamically adjusting the light from the one or more light sources, the feelings of the desired environment may be evoked within the indoor space. By maintaining the light output within the set of general illumination parameters, the effect of the dynamic adjustment may minimize distraction caused thereby.

A lighting fixture appears as a skylight and is referred to as a skylight fixture. The skylight fixture has a sky-resembling assembly and a plurality of sun-resembling assemblies. The sky-resembling assembly has a sky-resembling optical assembly and a sky-specific light source, wherein light from the sky-specific light source exits a planar interior surface of the sky-resembling light optical assembly as skylight light. The plurality of sun-resembling assemblies are arranged adjacent one another and extend downward from a periphery of the sky-resembling assembly. Each of the plurality of sun-resembling assemblies has a sun-resembling optical assembly and a sun-specific light source, wherein light from the sun-specific light source exits a planar interior surface of the sun-resembling optical assembly as sunlight light.

A process for providing a desired environment in an indoor space includes providing light from one or more light sources suitable for meeting a set of general illumination parameters and dynamically adjusting the light from the one or more light sources based on a set of simulated environment illumination parameters while maintaining the light within the general illumination parameters. By dynamically adjusting the light from the one or more light sources, the feelings of the desired environment may be evoked within the indoor space. By maintaining the light output within the set of general illumination parameters, the effect of the dynamic adjustment may minimize distraction caused thereby.