Abstract: The diffusive body lets first light enter and emits scattered light, wherein a scattering layer and a transmission layer, the diffusive body has a light incidence surface that lets the first light enter and a main surface where a first light emission surface emitting the scattered light is formed, the light incidence surface is formed at an end face forming a first end part of the main surface, the diffusive body functions as a light guide path that makes the entered first light move to and fro between the scattering layer and the transmission layer, the scattering layer includes an optical medium on a nanometer order and generates the scattered light by having the first light scattered by the optical medium on the nanometer order, and a correlated color temperature of the scattered light is higher than the correlated color temperature of the first light.

Abstract: A device for testing performance of main boards of electronic devices includes a housing, two bases, a control device, a humidifier, a heating device, and a refrigerating device. A cavity in the housing comprises separated first and second portions. The heating device is interconnected with the first portion to create a predefined high temperature environment and the refrigerating device is interconnected with the second portion to create a predefined low temperature environment. The humidifier is interconnected with the first portion and the second portion, and configured to create predefined degrees of humidity respectively in the first portion and the second portion. The bases are inside the first portion and the second portion, and electrically connected to the control device.

Abstract: Systems and methods for an intracanopy horticultural lighting fixture. In aspects, a horticultural luminaire has an edgelit lightguide or optical conduit extending from a housing with its major dimension extending along longitudinal axis L, and one or more endcaps coupled to respective lateral edges, endcaps being convex curved about one or more axes transverse the longitudinal axis to prevent catch points. The endcap can be coupled to the housing to hinder separation of the lightguide. In another aspect a horticultural luminaire has an edgelit lightguide generating an output having downwardly directed peaks at about +/?30 degrees from vertical. Light output is preferably batwing shaped and symmetric. Another aspect provides a method for intracanopy lighting having an entirely planar optical conduit, a major extent of the optical conduit disposed along its longitudinal axis (L), and supporting the optical conduit, preferably its entirety, below an upper plant canopy.

Abstract: Systems and methods for an intracanopy horticultural lighting fixture. In aspects, a horticultural luminaire has an edgelit lightguide or optical conduit (40) extending from a housing, a lightguide length extending along longitudinal axis L, and one or more endcaps (214) coupled to respective lateral edges extending along a height axis H, the endcap having a lightguide-receiving socket spaced (220) adjacent a lightsource housing-receiving socket (218). In other aspects the endcaps are convex curved about one or more axes transverse the longitudinal axis to prevent catch points. In another aspect a luminaire has an edgelit lightguide generating an output having downwardly directed peaks at about +/?30 degrees from vertical. Light output is preferably batwing shaped and symmetric. Another aspect is providing intracanopy lighting having a planar optical conduit, a major extent of which is disposed along its longitudinal axis (L), and supporting the optical conduit below an upper plant canopy.

Abstract: Systems and methods for an intracanopy horticultural lighting fixture. In aspects, a horticultural luminaire has an edgelit lightguide or optical conduit extending from a housing with its major dimension extending along longitudinal axis L, and one or more endcaps coupled to respective lateral edges, endcaps being convex curved about one or more axes transverse the longitudinal axis to prevent catch points. The endcap can be coupled to the housing to hinder separation of the lightguide. In another aspect a horticultural luminaire has an edgelit lightguide generating an output having downwardly directed peaks at about +/?30 degrees from vertical. Light output is preferably batwing shaped and symmetric. Another aspect provides a method for intracanopy lighting having an entirely planar optical conduit, a major extent of the optical conduit disposed along its longitudinal axis (L), and supporting the optical conduit, preferably its entirety, below an upper plant canopy.

Abstract: This Optical Device is conformed by an optical reflector and a filter, the reflector is a diffuse or specular metallic surface with a reflectance of not less than 98%, of shape and dimensions according to the lamp to be affected. The optical filter is a rigid structure and transparent to visible light, with geometric shape and dimensions also according to the lamp to be affected, it is made of organic or inorganic material, and serves as a substrate on which a layer of zinc oxide is applied, specifically a nano structure of zinc oxide nano wires, to form a partially reflective and anti-reflective layer simultaneously as a function of the wavelength of the light that passes through it.

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: Illumination device for illuminating an environment (7), including a visible source (2), which emits a visible beam, and a diffuse light generator (2, 4; 68; 150), which includes an optical structure (4; 64; 150) delimited by an inlet surface (Si; S3), which receives the visible beam, and by an outlet surface (S2). The generator emits from the outlet surface diffuse visible light and direct visible light. The illumination device further includes an infrared optical source (15), which is different from the first visible source and emits an infrared beam so as to impinge on the inlet surface; the optical structure transmits at least one portion of the infrared beam. The illumination system further includes a ventilation system (40) which can be coupled to the environment, which introduces air masses into the environment, in pulsed mode.

Abstract: A lighting apparatus includes at least one primary light source for emitting primary light, at least one phosphor body arranged at a distance from the primary light source, for converting the wavelength of primary light into secondary light, and at least one at least partly dichroic mirror, which at least partly deflects primary light radiated thereon onto at least one phosphor body and which passes secondary light radiated by the phosphor body. Used light radiated by the lighting apparatus contains the secondary light and primary light radiated by at least one primary light source, and the dichroic mirror includes at least one first and second mirror regions, in such a way that the first mirror region deflects primary light onto at least one phosphor body and passes secondary light incident from the phosphor body, and that the second mirror region deflects primary light in a manner circumventing the phosphor body.

Abstract: A data reading system and method, such as for reading optical codes on objects being passed through a read zone, including one or more imagers and at least one illumination module having a reflector housing that includes a baffle structure with a first inner surface and a second inner surface, and a light source disposed at the rear end of the reflector housing and operative to generate illumination out through the baffle structure along an outgoing illumination path, wherein at least one of the inner surfaces of the baffle structure comprises a dielectric material operative to exhibit high reflectivity to light rays from the light source impinging at a high incidence angle and to exhibit low reflectivity to light rays from the light source impinging at a low incidence angle, thereby minimizing stray light impinging on the eyes of the operator while maximizing on-target illumination.

Abstract: A glass space partitioning system that is capable of supporting heavy and/or operable glass panels in throughout a range of partially-integrated or fully-integrated configurations, and which integrates an LED-strip light assembly for edge-lighting the glass panels. The system generally includes a framing member comprising a U-shaped horizontal profile with side walls, an intermediate profile attached to the U-shaped profile, a glass pane seated edgewise between a side wall of the U-shaped profile and the intermediate profile, a flexible LED strip cut to length and snap-fit in a vertical orientation against the side wall of the U-shaped profile and adjacent the glass pane for edge lighting, and a cover profile attached to the intermediate profile securing the foregoing.

Abstract: Chromatic components are presented which alleviate the usage in various applications in that this chromatic component is, according to a first aspect of the present application, made-up of a mirroring surface and a diffusing layer in front of the mirroring surface, which preferentially scatters short-wavelength components of impinging light with respect to long-wavelength components of the impinging light, and in that according to another aspect, the chromatic component is made up of a stratified-glass panel which comprises two less sheets sandwiching an adhesive transparent polymeric film wherein the adhesive transparent polymeric film forms a diffusing layer which preferentially scatters short-wavelength components of light passing the stratified-glass panel with respect to long-wavelength components of this light with respect to long-wavelength components of the same.

Abstract: A planar illumination apparatus according to an embodiment includes a light source and a light guide plate. The light source includes a light emitting diode and a wavelength conversion material that is excited by light emitted from the light emitting diode so as to emit light, and emits white light. The light guide plate includes an incident end surface on which the light source is disposed, and an emission surface that emits light incident from the incident end surface. The light guide plate is provided with a light scattering unit on at least one of the emission surface and a rear surface opposed to the emission surface. The light scattering unit mainly scatters light emitted from the light emitting diode than light emitted from the wavelength conversion material.

Abstract: A system and method for providing light to a plant with a life cycle that includes a seedling growth period, a vegetative growth period, and a flowering growth period. Illumination to the plant is provided with an array of LEDs that contains red LEDs, blue LEDs and white LEDs. During the seedling growth period, no red LEDs are illuminated. Blue and white LEDs are lit, wherein the blue light is more intense than the white. During the vegetative growth period, white and blue LEDs are lit, wherein the white light is more intense than the white. During the flowering growth period, red and white LEDs are lit, wherein the red light is more intense than the white light. The change in coloring and intensity has beneficial effects during each growth period and at the same time inhibits insects.

Abstract: A plant cultivation apparatus of the present disclosure includes a first light source unit configured to include a first laser diode radiating a first light beam, and a first scanning mechanism scanning the first light beam and forming a first radiation region, a second light source unit configured to include a second laser diode radiating a second light beam, and a second scanning mechanism scanning the second light beam and forming a second radiation region, and a signal processor configured to control the first light source unit and the second light source unit. A wavelength of the first light beam is the same as a wavelength of the second light beam. The signal processor forms a multiple radiation region by causing the first radiation region and the second radiation region to overlap each other.

Abstract: The invention provides a lighting unit (1) comprising a light source (20) and an actuator (40). The light source (20) is arranged to generate, during use, a light beam (B) whose light intensity is dependent upon an electrical power signal (I; V). The actuator (40) is arranged to orient, during use, the light beam (B) in an orientation dependent upon the electrical power signal (I; V). The orientation of the light beam has a pre-determined relationship to the light intensity of the light beam. The invention further relates to a lighting system (100) comprising at least one lighting unit, a space (1000) comprising such a lighting system, and a use of such a lighting system.

Abstract: A display apparatus includes: a display panel to display a first image having a first image spectrum corresponding to a first animal spectral sensitivity curve of a first cone cell of an animal, and to display a second image having a second image spectrum corresponding to a second animal spectral sensitivity curve of a second cone cell of the animal, in response to output image data. At least one of the first and second animal spectral sensitivity curves is different from first, second, and third human spectral sensitivity curves of cone cells of a human that perceives red, green, and blue colors.

Abstract: The present invention relates to a lighting device (300) having a housing (302) and multiple light sources (308) arranged in the housing. The light sources emit light of a first wavelength range. The lighting device includes a wavelength converting member (310) arranged at a distance from the light sources, and it comprises a first wavelength converting material configured to convert a part of said light of a first wavelength range into light of a second wavelength range. The lighting device further includes a color distribution member (312) providing a color distribution of the light emitted from the lighting device where the ratio of intensity of light with the first wavelength range to the intensity of light with the second wavelength range is larger at low angles to a light output surface of the lighting device than at high angles to the light output surface.

Abstract: A light-emitting diode module includes a carrier and a plurality of optoelectronic semiconductor chips mounted on a carrier top and configured to generate primary radiation. The semiconductor chips are arranged in part at a first distance and in part at a second, greater distance from one another. Between the adjacent semiconductor chips arranged at the first distance from one another there is located a radiation-transmissive first filling for optical coupling. Between the adjacent semiconductor chips arranged at the second distance from one another there is located a radiation-opaque second filling for optical isolation.

Abstract: Provided is a weathering test instrument that includes: a light source section including a plurality of solid-state light-emitting elements, in which the solid-state light-emitting elements are different in kind from one another, and are configured to emit light beams having respective wavelength regions that are different from one another; a light receptor configured to receive the light beams radiated from the light source section individually for the respective wavelength regions; and a controller configured to control radiant intensities of the respective solid-state light-emitting elements individually, based on received light amounts for the respective wavelength regions derived from the light receptor, and thereby control irradiance at a sample surface for each of the wavelength regions to allow an accelerated test of a sample to be performed.

Abstract: A simulated sunlight irradiation apparatus (100) has transmittance adjustment members (13a and 13b) provided above an irradiation surface of a light guide plate (10) and in the vicinity of either incident face of the light guide plate (10) on which simulated sunlight is incident. The transmittance adjustment members (13a and 13b) adjust the transmittance of light in a portion of a wavelength band of simulated sunlight that is emitted from the irradiation surface of the light guide plate (10), thus bringing about improvement in spectral coincidence of the simulated sunlight. This provides a simulated sunlight irradiation apparatus that can radiate simulated sunlight with high spectral coincidence.

Abstract: A system may include a housing, a diffuser configured to rotate between two positions, a series of lenses correlating to a series of LED lights, and a base. The diffuser may contain one or more lenses that may be arranged to align with the LED lights allowing light transmission.

Abstract: One spectrum correction filter that changes a spectral characteristic of emission light from the light source, at least one neutral density filter disposed on the same optical axis of the spectrum correction filter, wherein the at least one spectrum correction filter and/or the at least one neutral density filter is tilted so that a travel direction of reflection light reflected from the at least one spectrum correction filter is deviated from the optical axis.

Abstract: A combination mirror and media display device assembly is provided. The combination mirror and media display device includes a mirror platform having a media display device viewing area and a media display device coupled to the mirror platform. The media display device is positioned to display images through the media display device viewing area.

Abstract: A solar simulator including an array of lamp modules, wherein each lamp module of the array includes a lamp configured to generate light, a homogenizer having an input end and an output end, a beam divergence lens positioned to focus the light onto the input end of the homogenizer, and an imaging lens positioned to receive the light from the output end of the homogenizer and image the light onto a target plane.

Abstract: An artificial sunlight radiation device (10) includes a xenon light source (9), a condensing element (2), a tapered coupler (3), an optical filter (4), a light guide plate (16), a light extracting member (17), and a side-surface reflection member (15) that is provided at one or more side end surfaces of the light guide plate (16), reflects a portion of the light output from the light guide plate (16), and directs the portion of the light toward a radiation surface.

Abstract: A system for combining exterior light with artificial lighting, comprising a light shielding arrangement (2) for shielding exterior light from a space (5) and at least one light source (6) arranged to emit artificial light that is directed toward the exterior side of the light shielding arrangement (2), which light source (6) is controllable in response to current exterior lighting conditions. The system further comprises a controller (8) connected to said light source (6), which is arranged to control light emission of the light source (6) in response to a current position of the light shielding arrangement, so as to emulate an effect of exterior light escaping through the light shielding arrangement. The artificial light can thus be controlled (manually or automatically) to compensate for lack of sufficient exterior light, and the controller ensures that the artificial light is emitted in such a way as to be perceived as exterior light.

Abstract: A light source device (10) according to the present invention includes a first light source (1) and a first condensing member (2) that has a first opening (24) and that outputs output light from the first light source (1) through the first opening (24). The first condensing member (2) is constituted of a front condensing member (2a) that includes the first opening (24) and a rear condensing member (2b) that does not include the first opening (24). The rear condensing member (2b) is detachable from the first condensing member (2).

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 simulated sunlight irradiation apparatus of the present invention (100a) includes: a light guide plate (5) having an irradiation surface and a counter surface opposite to the irradiation surface; and a light absorbing member (8) which is provided on at least one of an irradiation surface side and a counter surface side of the light guide plate (5) and absorbs light in a predetermined wavelength region.

Abstract: A solar simulator for testing photovoltaic cells is disclosed herein. The solar simulator includes a housing having an opening through which light is emitted. The solar simulator employs a plurality of concave cylindrical mirrors and a plurality of flat mirrors that reflect and redirect images of an illuminated light source such that an observer at a target area outside the housing will perceive multiple instances of the illuminated light source. The housing also contains a flat top cover mirror and a flat bottom cover mirror that function to reflect additional light through the opening and toward the target area.

Abstract: An optical element, a lighting system and a luminaire is provided. The optical element comprises a plate 100 and a plurality of collimating means. The optical element is to be used in front of a light source comprising a light emitting surface 106, and the optical element is configured to obtain a skylight appearance. The plate 100 is to be arranged parallel to the light emitting surface 106. The plate 100 is opaque and comprises a plurality of holes 104. The plate 100 further comprises a reflective surface 102 which is to be arranged parallel to the light emitting surface 106. The reflective surface 102 is light reflective in a predetermined spectral range to obtain a blue light emission 100. The plurality of collimating means collimate a part of the light received from the light source to obtain a collimated light beam 112 in a specific direction. Each one of the collimating means comprises one of the plurality of holes of the plate 104.

Abstract: A tubular skylight, comprising a tubular body (2) provided with an inner reflecting surface (3), a light collector (4) mounted to a first end of the tubular body (2) and a light diffuser (6) mounted to a second end of said tubular body (2). The skylight further comprises a source of artificial light (9) external to the tubular body (2) to enable it not to interfere with the natural light, and mounted in the vicinity of the diffuser (6). This artificial-light source (9) is preferably defined by a plurality of LEDs positioned around the diffuser (6) itself.

Abstract: In a simulated sunlight irradiation apparatus (100), at least one of at least one optical filter (4) and at least one optical filter (6) is provided so as to be switchable with another optical filter (14 or 16) having a transmittance characteristic that is different from a transmittance characteristic of the at least one of the at least one optical filter (4) and the at least one optical filter (6).

Abstract: An embodiment of a lighting system for illuminating an environment with a lighting that simulates natural lighting 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 box which hosts the first light source, the dark box being optically coupled to the environment via the diffused-light generator.

Abstract: The present application is directed to an optical filter system for use in a solar simulator, and includes at least one supplemental filter configured not to transmit light having a wavelength of 295 nm or less and to output at least one conditioned signal at least one WG320 optical filter configured to be irradiated by the conditioned signal and output at least one partially filtered signal having a wavelength of about 300 nm or greater, and at least one UG11 pass filter configured to be irradiated by the partially filtered signal and output at least one output signal having a wavelength of about 300 nm to about 400 nm.

Abstract: Xenon light emitted from a xenon light source heads for a wavelength-selecting mirror through a taper coupler and an air mass filter. The wavelength-selecting mirror reflects a short wavelength component of the xenon light and emits the short wavelength component to a taper member. Halogen light emitted from a halogen light source heads for a wavelength-selecting mirror through a taper coupler and a reflecting mirror. The wavelength-selecting mirror transmits a long wavelength component of the halogen light and emits the long wavelength component to the taper member. The taper member has width gradually decreasing from an entrance plane for light to an exit plane for the light. The light emitted from the taper member is changed so that a radiation directivity of a component originating from the xenon light becomes similar to a radiation directivity of a component originating from the halogen light.

Abstract: A simulated sunlight generating device for generating a simulated sunlight required for evaluating performance of solar cells includes a plurality of driving units, a plurality of light-emitting units, and a plurality of adjusting units. The driving units drive the light-emitting units to emit light. The adjusting units enable the light of the light-emitting units to not only propagate along the same light route but also be added up and combined to form the simulated sunlight of an intended wavelength with ease of installation, ease of maintenance, low costs, high flexibility, and high efficiency.

Abstract: An optical element (100) for use in front of a light source (102) for obtaining a skylight appearance, a lighting system and a luminaire are provided. The optical element (100) comprises a light transmitting cell which comprises a light transmitting channel (116), a light input window (106), a light exit window (110) and a wall (108). The light transmitting channel (116) collimates a part of light (104) emitted by the light source (102). The light input window (106) is arranged at a first side of the light transmitting channel (116) and receives light (104) from the light source (102). The light exit window (110) emits light with the skylight appearance. At least a part of the light exit window (110) is arranged at a second side of the light transmitting channel (116) opposite to the first side. The wall (108) is interposed between the light input window (106) and the part of the light exit window (110). The wall (108) encloses the light transmitting channel (116).

Abstract: Solar simulator comprising at least at least one high-intensity discharge (HID) lamp type, and at least one halogen lamp type, which lamps are applied simultaneously and are provided with infrared filter means to provide a mixture of light approximating radiated sunlight, wherein the infrared filter means are embodied as heat reflective foil mounted on a transparent substrate. The heat reflective foil is preferably provided with a repetitive pattern of perforations.

Abstract: A simulated sunlight irradiation apparatus (100) has transmittance adjustment members (13a and 13b) provided above an irradiation surface of a light guide plate (10) and in the vicinity of either incident face of the light guide plate (10) on which simulated sunlight is incident. The transmittance adjustment members (13a and 13b) adjust the transmittance of light in a portion of a wavelength band of simulated sunlight that is emitted from the irradiation surface of the light guide plate (10), thus bringing about improvement in spectral coincidence of the simulated sunlight. This provides a simulated sunlight irradiation apparatus that can radiate simulated sunlight with high spectral coincidence.

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 plant growing system of the present invention includes: a first light source for irradiating red light to a plant; a second light source for irradiating far-red light to the plant; a control part that controls irradiation operations of the first light source and the second light source; and a time setting part that sets a time zone in which the control part operates the irradiation of the first light source and the second light source. The time setting part is designed such that the first light source starts red light irradiation before sunset; and the second light source starts far-red light irradiation after the red light irradiation.

Abstract: The invention relates to a variable-spectrum solar simulator for characterising photovoltaic systems. The simulator can be used to obtain a spectrum adjusted to the solar spectrum, both for a standard spectrum or a real spectrum adjusted to local irradiation conditions. The simulator also allows the spatial-angular characteristics of the sun to be reproduced.

Abstract: A pseudo sunlight emitting device includes a first light source for emitting first light having a certain spectral distribution; a first light guide member for receiving, at its light incident surface, the first light from the first light source, and for emitting, via its light emission surface, light having a controlled directivity; a first optical filter for adjusting a spectrum of the light emitted from the first light guide member; a second light source for emitting second light whose accumulative irradiance in an infrared wavelength region is greater than an accumulative irradiance of a wavelength region of light shorter in wavelength than infrared light; second light guide members for receiving, at their light incident surfaces, the second light from the second light source, and for emitting, via their light emission surfaces, light having a controlled directivity; a second optical filter(s) for adjusting a spectrum of the light emitted from the second light guide member, a number of the second light gu

Abstract: A light guide member of the pseudo-sunlight irradiation apparatus is formed of eight light guide plates WG1?-WG8? arrayed in one direction. A light diffusing part formed of a plurality of dot-like protrusions 701, 702 is formed on a surface opposite to an irradiating surface of each of the light guide plates WG1?-WG8?. A dot diameter of the dot-like protrusions 701 of the light guide plates WG1?, WG8? positioned at ends in the one direction orthogonal to the light guide direction of the light guide plates WG1?-WG8? is made larger than a dot diameter of the dot-like protrusions 702 of the light guide plates WG2?-WG7? positioned at central portions other than the ends in the one direction.

Abstract: A solar lighting apparatus uses optical fibers to transmit solar light for illumination. The apparatus includes a support frame, optical fibers, a hybrid solar light diffuser and a reflective sheet. The optical fibers are fastened to the support frame and are spaced apart from each other at regular intervals. The hybrid solar light diffuser is coupled to a lower portion of the support frame and includes a diffusion plate and diffusion lenses which are provided on the diffusion plate at positions corresponding to the respective optical fibers. Each diffusion lens has a width increasing from a top thereof to a bottom. An incident depression is formed in the upper end of each diffusion lens. A reflective surface is formed on the circumferential outer surface of each diffusion lens to diffuse and reflect solar light. The reflective sheet is applied to the lower surface of the support frame.

Abstract: The LED grow light fixture uses a densely-packed array of high-brightness LEDs that are not individually packaged where the array behaves similarly to a point source of light. The extended point source LED array, with its lens and associated reflector, result in a concentrated, partially-collimated light source, such that the intensity of the light does not diminish rapidly as distance from the light source increases. The LED array contains a plurality of LED strings that may be separately controlled, thereby allowing the spectral content of the LED grow light to be varied, to facilitate desired plant growth at various stages of plant life. The light emitted at each of the multiple different wavelengths from the array is evenly distributed, when the objects being illuminated by the array are at a distance of less than about 6 feet or even less than 1 foot from the array.

Abstract: The invention relates to a daylight illumination apparatus. A daylight collector (3) collects daylight (4), which is guided to an illumination location to be illuminated along an optical path by a light guide (5), wherein the daylight is absorbed by the light guide. A photoluminescent material (6, 8) is arranged within the optical path and emits photoluminescent light that compensates for the absorption of the daylight by the light guide. Absorption losses of the daylight can therefore effectively be compensated, without necessarily needing, for example, an active compensation light source. This allows providing compensated day-light illumination in a technically relatively simple way.

Abstract: A solar simulator includes a source producing radiation and filter material for the source having a higher transmittance at predetermined wavelengths for radiation incident at non-normal angles to the filter material. A collimator between the source and the filter material absorbs a fraction of the non-normal incident radiation to lower the amount of radiation at the predetermined wavelengths reaching the filter material. In one example, the collimator is a metallic honeycomb substrate. The collimator may also include baffles.