In a light source device, an axis extends from a light-emitting face and perpendicularly to the light-emitting face. A reflective surface includes a curved surface defined by rotating a first arc which is a part of an ellipse around the axis. The ellipse has a first focal point and a second focal point which are located on the light-emitting face. The second focal point is located adjacently to the first arc with respect to a center of the ellipse. A distance from the first focal point to the axis is shorter than a distance from the second focal point to the axis.

Examples of the present disclosure provide a light distribution element, a light source module and a lamp, the light distribution element includes a light entry surface, a first light exit surface and a second light exit surface, the first light exit surface is configured to receive part of light entering the light entry surface and emit the part of the light entering the light entry surface; the second light exit surface is a reflective surface, and the second light exit surface is configured to receive part of the light entering the light entry surface and reflect the part of the light entering the light entry surface; and a direction of the light emitted from the second light exit surface is different from a direction of the light emitted from the first light exit surface, it can be used for key lighting and lighting ceiling areas respectively.

A luminaire module (100) includes light-emitting elements (LEEs) (110) arranged to provide light; a light guide (130) including a receiving end (131a) and an opposing end (131b), the receiving end (131a) arranged to receive light provided by the LEEs (110), a core (134) including a first transparent material with a first refractive index (n1), the core (134) having a pair of opposing side surfaces (132a, 132b) extending along a length of the light guide (130) between the receiving and opposing ends (131a, 131b), and a cladding (136) including a second material having a second smaller refractive index (n2), the cladding (136) extending across and being in contact with at least a portion of the opposing side surfaces (132a, 132b) forming a cladding-core interface. The cladding-core interface is optically smooth. Additionally, the luminaire module (100) includes an optical extractor (140) arranged to receive guided light from the opposing end (131b) of the light guide (130) and configured to output into the ambient environment at least some of the received guided light.

An indoor illumination device includes a compartment-side ceiling member, a lighting body support base, a direct illumination lighting body, and an indirect illumination lighting body. The lighting body support base is attached to the compartment-side ceiling member. The direct illumination lighting body is supported by a lighting body support base such that an illumination section of direct illumination lighting body is disposed below the compartment-side ceiling member and direct light is radiated into the passenger compartment. The indirect illumination lighting body is supported by a lighting body support base such that an illumination section of the indirect illumination lighting body is disposed above the compartment-side ceiling member and reflected light is radiated into the passenger compartment. The lighting body support base extends in a vehicle forward/rearward direction at an outer side portion of the ceiling section in the passenger compartment in a vehicle width direction.

An illumination device includes a plurality of light-emitting elements (LEEs); a light guide extending in a forward direction from a first end to a second end to receive at the first end light emitted by the LEEs and to guide the received light to the second end; an optical extractor optically coupled to the second end to receive the guided light, the optical extractor including a redirecting surface to reflect a first portion of the guided light, the reflected light being output by the optical extractor in a backward angular range, and the redirecting surface having one or more transmissive portions to transmit a second portion of the guided light in the forward direction; and one or more optical elements optically coupled to the transmissive portions, the optical elements to modify the light transmitted through the transmissive portions and to output the modified light in a forward angular range.

A light fixture delivering electrically controlled lighting distributions for mounting within an installed panel system typically used in ceiling and wall constructions and incorporating acoustic, drywall or wood panels. The light fixture can provide low-glare or wide spread “batwing” ambient light or more directional wall wash, task and accent lighting. The light fixture comprises one or more LED boards and an optical element which can be back-lit or edge-lit. The light fixture body is configurable, comprising a 3-dimensional extruded elongate body with its ends cut at a configured angle. The body typically comprises additional side support features that support and enclose the edge of installed panels. In the case of a T-bar based ceiling grid system the side support features may also replicate the function and appearance of T-bar horizontal and vertical portions. The body comprises features to retain and align LED boards, reflectors and a back-lit or edge-lit optical element. In the edge-lit configuration the optical element may also be a light guide. The edge-lit design also enables the height of the lighting assembly body to be equivalent to or less than the height of T-bar main beams or cross tees. This is very important in applications where there is zero or little available plenum space above the ceiling grid. Because the lighting assembly can also provide structural support within the installed panel system it can replace one or more T-bars and can also be used to connect one or more T-bars or other structural grid elements. The lighting fixture can be mounted at an oblique or diagonal angle to the typical square grid layouts, or in a corner of a ceiling grid T-bar cell at the intersection of one or more T-bars. Additionally, more than one elongate bodies can be connected to form square, crosses, curves or arcs or more complex shapes. The electrical power may additionally be configured to control lighting distributions of the fixtures independently of one another.

Various light fixtures are provided for mounting within and below suspended grid ceilings incorporating T-bars and ceiling panels. The light fixtures comprise a double or single edgelit planar or wedge shaped optical element that functions simultaneously as an outcoupling TIR light guide and a light scatterer or direct throughput lens. It provides a number of benefits because of its edgelit design including; thin forms and shallow depth, extended emitting area and controlled lighting distributions from one or two light guide faces. Additionally, areas typically dedicated to bezels or edge reflectors can be greatly reduced or eliminated due to decreased hotspotting to provide a fixture face with very high percentage of light emitting area. Embodiments are described for direct, indirect, and direct indirect configurations. The embodiments provide increased light output, uniformity of brightness and color and controlled direct and indirect lighting distributions and with single or dual off axis intensity peaks. Such light distributions are particularly useful in applications such as direct illumination of offices, schools, hospitals, retail or commercial spaces and table tops or work surfaces or indirect illumination of ceilings, wall washing and surface area lighting as well as other lighting applications.

A optically transmissive component is configured within a light fixture to provide benefits in brightness uniformity and visual appearance with the use of a light scattering extension portion that provides light scattering of light emitted from near an input edge of a light guide or other edgelit optical element. The sequential propagation of light through both the extension portion and main portion of the optically transmissive component significantly reduces the higher brightness and uneven “hotspotting” type visual defects typically produced near the input edge of an edgelit optical system. With appearance constraints removed or reduced, edgelit light fixtures with higher output, higher efficacy, and/or simplified edgelit optical components are enabled. Embodiments include the use of the extension portion of the optically transmissive component extension to mechanically position and retain an edgelit optical element within a light fixture.

The present invention relates to the technical field of lighting for plant, and in particular, provides a multi-reflection panel lamp. The multi-reflection panel lamp includes a fixing frame, a plurality of panel lamps, and a plurality of reflectors. The plurality of panel lamps are embedded in the fixing frame parallel to each other. The reflectors and the panel lamps are parallelly disposed on the fixing frame. Compared to other panel lamps, in the present invention, reflectors are disposed between panel lamps to reflect, a plurality of times by using a multi-refraction mechanism of the reflectors of the panel lamps, rays of light emitted by the panel lamps, so that plants are irradiated with the rays of light at various angles, thereby improving lighting intensity and uniformity and ensuring normal growth of the plants.

Reflector assemblies and lighting devices incorporating such reflector assemblies are disclosed and described. The reflector assembly includes a reflector body defining an interior reflective surface that in some embodiments has a shape akin to a compound elliptic paraboloid. One or more LEDs can be maintained relative to the reflector body such that an entirety of a light cone emitted by the LED reflects from the interior reflective surface out to the world as a collimated beam. Lighting devices enable light rays to travel with a greater solid angle from LEDs than traditional in-plane optics. Light from a directional point source with a mounting position that is embedded in reflector body oriented to face an opposing curved mirror wall surface so light rays that are diverging prior to reflecting off the interior reflective surfaced are merged together after the reflective bounce to travel in parallel as a collimated beam.