The invention provides a lighting device for providing light, the lighting device comprising a closed chamber with a light transmissive window and a light source configured to provide light source radiation into the chamber, wherein the chamber further encloses a wavelength converter configured to convert at least part of the light source radiation into wavelength converter light, wherein the light transmissive window is transmissive for the wavelength converter light, wherein the wavelength converter comprises luminescent quantum dots which upon excitation with at least part of the light source radiation generate at least part of the wavelength converter light, and wherein the closed chamber comprises a filling gas comprising one or more of helium gas, hydrogen gas, nitrogen gas or oxygen gas, the filling gas having a relative humidity at 19° C. of at least 5%.

The present invention generally relates to a photoluminescent activator apparatus, a photoluminescent composition, a method of making, and a method of using the activator and composition, and more particularly to a system and method to illuminate objects and/or materials. Accordingly, the invention is directed to photoluminescent activator, photoluminescent composition, method of making and using the same that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.

An illumination panel including an optically transmissive, hollow multiwall structure and an array of LED strips distributed within a series of hollow chambers formed by the multiwall structure. The hollow multiwall structure is formed by two or more sheets of optically clear or translucent material joined by a plurality of transverse ribs. Each LED strip includes an array of interconnected light emitting diodes and is preferably provided with one or more light diffusing or beam-shaping elements included into one or more hollow chambers.

A light fixture includes a light source, a wavelength-conversion material, and a reflector. The light source is configured to emit a first radiation, and has a front surface and a back surface. The wavelength-conversion material is arranged under the front surface and configured to convert the first radiation to a second radiation which has a first portion not able to reach the reflector and a second portion able to reach the reflector. The reflector is arranged over the back surface and configured to reflect the second portion away from the light source without passing through the wavelength-conversion material. The reflector has an end distant from the light source and is arranged in an elevation different from that of the wavelength-conversion material.

An arrangement (1) for generating white light (5), having at least two light-emitting diodes, wherein the first diode (2) is designed to generate blue light, wherein a conversion element (4) is associated with the first diode, wherein the conversion element is designed to convert a part of the blue light from the first diode into green light, and wherein the conversion element is designed to convert a part of the blue light from the first diode into red light, wherein the second diode (3) is provided to emit red light.

An LED lighting device of embodiment comprising an LED light source which generates an ultraviolet light or a visible light, an axisymmetric transparent member which is provided over the light source and which is transparent to visible light, and an axisymmetric light scattering member disposed in the transparent member apart from the light source. A distance of closest approach L.sub.2 between the light source and the light scattering member, and an area C of a light emitting surface of the light source satisfy the settled relation. A length L.sub.1 of the light scattering member, and an absorption coefficient μ (1/mm) of the light scattering member satisfy the settled relation. A diameter d.sub.1 of the bottom surface of the light scattering member, the distance of closest approach L.sub.2, and a refractive index n of the transparent member satisfy the settled relation.

The present invention relates to lighting module, wherein a light exit window (12) of the lighting module is engraved such that the output color temperature of said lighting module is tuned. The present invention also relates to a method for tuning an output color temperature of a lighting module, said method comprising providing said lighting module comprising a light exit window (12), and a light source arranged to provide light having an optical path through said light exit window (12), said lighting module having a first output color temperature; and engraving a surface of said light exit window (12) such that the output color temperature of said lighting module is tuned to a second output color temperature.

A sheet light source is described that has a width in a front-to-back “x” direction, a length in a left-to-right “y” direction, and a height in a bottom-to-top “z” direction. The sheet light source includes a bottom conductive surface, a laser diode, a transparent conductive sheet, and an adhesive material portion. The laser diode is mounted on the conductive surface in the “z” direction. The transparent conductive sheet is laminated onto the laser diode and the conductive surface in the “z” direction. The adhesive material portion is located between the conductive sheet and the conductive surface, and binds the transparent conductive sheet to the laser diode and the conductive surface. The adhesive material portion further enables photons, emitted substantially in the “x” direction from the laser diode, to propagate therein to an edge and be output.

The light source is based on a high-efficiency solid-state laser source of the excitation coherent radiation and a single crystal phosphor which is machined in a form of an optic element for emitted light parameterisation. The single crystal phosphor is produced from a single crystal material on the basis of garnets of the (A.sub.x, Lu.sub.1-x).sub.aAl.sub.bO.sub.12:Ce.sub.c general formula or from a single crystal material on the basis of perovskite structure of the B.sub.1-qAlO.sub.3:D.sub.q general formula. The efficient light source shall be utilized e.g. in the automotive industry.

A method of manufacturing a fluorescent-material-containing member includes: providing a fluorescent member including a fluorescent material, the fluorescent member having a first main surface side including a plurality of projections; disposing a powder of a light-reflective member between the projections of the fluorescent member; obtaining a sintered body by sintering the powder of the light-reflective member, and removing part of the sintered body from at least one of a first main surface side and a second main surface side of the fluorescent member to obtain the fluorescent-material-containing member including a first surface arranged on the first main surface side has and defined by the fluorescent member and the light-reflective member, and a second surface arranged on the second main surface side has and defined by the fluorescent member and the light-reflective member or defined solely by the fluorescent member.