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.

A lighting device includes at least one first light-emitting element configured to emit a first light of a first wavelength range; and a light guide having axially opposite first and second base surfaces, and a plurality of segments, each with a first light in-coupling surface formed on a lateral surface of the light guide, each of the segments configured to convert at least a part of input light into second light having a selected wavelength range. At least a portion of the first base surface includes a second light in-coupling surface and at least a portion of the second base surface includes a light out-coupling surface. The lighting device is optically coupled to the second light in-coupling surface such that the first light is coupled into the light guide, and the first light emitting element is configured to reflect at least part of the second light thereon having a wavelength within at least one of the selected wavelength ranges back into the light guide.

Radial emission optical fiber terminations that include conical elements can prevent axial emission and redirect all incident light to radial positions. One termination includes an optical fiber having an up-tapered terminus, the up-tapered terminus having a maximum taper diameter of at least 1.5 times the core diameter and ending at a cone-tip which has an apex angle in a range of about 70° to about 100°. Another termination includes a fiber cap that is a unitary construction of a glass tube and an optical element that bisects the glass tube. The glass tube includes an open end adapted to receive an optical fiber and a closed end. The optical element, consisting of fused quartz or fused silica, has an input face proximal to the open end of the glass tube and a conical face proximal to the closed end of the glass tube.

The invention provides a lighting device (1) comprising: —one or more light sources (10) configured to provide light source light (11); —a luminescent element (5) comprising an elongated light transmissive body (100); the elongated light transmissive body (100) comprising a luminescent material (120) configured to convert at least part of light source light (11) received at one or more radiation input faces (111) into luminescent material light (8), and the luminescent element (5) configured to couple at least part of the luminescent material light (8) out at the first radiation exit window (112) as converter light (101); wherein the light transmissive body (100) has a first index of refraction n1; —a beam shaping optical element (224) optically coupled with the first radiation exit window (112), the beam shaping optical element comprising a radiation entrance window (211) configured to receive at least part of the converter light (101); wherein the beam shaping optical element (224) has a second index of refraction n2; wherein: −0.75≤n1/n2≤1.25; 15 —the beam shaping optical element (224) or an optical connector (300) configured between the elongated light transmissive body (100) and the beam shaping optical element (224) comprise a glass material (310), wherein the glass material (310) is based on at least one or more of bismuth oxide, boron oxide, potassium oxide, lithium oxide, phosphorus oxide, lead oxide, tin oxide, antimony oxide, tellurium oxide, silicon dioxide, and vanadium oxide.

Embodiments of a light diffusing device with a color conversion layer are disclosed. Specifically the color conversion layer includes a luminophore that converts light from a higher wavelength to a lower wavelength.

A light-guide sunroof assembly comprises a plastic substrate and a light source module furnished besides the plastic substrate. An outer layer of the plastic substrate is added with dye to form a colored background. A plurality of light-guide microstructures is furnished on the plastic substrate to guide the light generated by the light source module toward an inner surface of the plastic substrate. Thereby, the light generated by the light source module is guided by the plastic substrate and then ejects out of the inner surface of plastic substrate, so as to provide a light decoration or lighting effect that enriches the visual experience. Moreover, the plastic substrate is first formed into a curved plastic plate through a hot pressing process, and then a connecting structure is formed and fixed on the plastic plate by an insert-molding injection process, in order to replace the traditional car sunroof mechanism which is assembled by glass plate bonded with metal connecting parts.

A fiber includes a core and cladding, both of which may have temperature dependent indices of refraction. The materials and size of the core and cladding may be selected such that as the temperature of the core and/or cladding is heated above room temperature, the fiber transitions from supporting multimode optical waveguiding to supporting single mode waveguiding.

An illumination system having a plurality of light emitting diodes (LEDs) and multiple layers of optical elements used to distribute light emitted by the LEDs. The optical elements may include a planar optical waveguide, a plurality of non-imaging lenses, a two-dimensional pattern of light extraction elements, a reflective surface, a light diffusing layer. The illumination system may further have a plurality of luminescent centers distributed in a volume of a planar layer of an optically transmissive material or one or more light converting elements used for converting light.

Light diffusing optical fibers for use in illumination applications and which have a uniform color gradient that is angularly independent are disclosed herein along with methods for making such fibers. The light diffusing fibers are composed of a silica-based glass core that is coated with a number of layers including both a scattering layer and a phosphor layer.

An optical fiber includes an integrated detector in the form of phosphors that emit light of a characteristic frequency or wavelength in response to leakage, through the fiber cladding, of light having an interrogation wavelength 1. Stimulation of phosphor emission by the interrogation light is indicative of aging or wear on the layers surrounding the cladding, and therefore can be used to assess the risk of imminent breakage of the fiber.