Abstract: An edgelit multifunctional lighting assembly is configured as a cross tee within a suspended ceiling system and supports at least one ceiling panel and is configurable to produce symmetric and asymmetric targeted light distributions for narrow and wide angle illumination applications.

Abstract: A mounting plate assembly has a mounting plate for mounting a light fixture in holes of different diameters and wherein a guide rail assembly is secured to a rear face of the mounting plate on opposed sides of an aperture. Each guide rail assembly has a novel displaceable spring clamp structure having to a displaceable base coupled for sliding displacement along a guide rail assembly. Spring biasing elements are provided between the displaceable base and the guide rail assembly to urge a bottom face of the displaceable base against a flat top surface of a mounting base to which the guide rails are secured.

Abstract: The present disclosure relates to the technical field of lamps, and discloses a split type single-buckle lamp. The split type single-buckle lamp includes an inner lamp holder, and a bulb in threaded connection with the inner lamp holder; the inner lamp holder is connected with a live conductor wire; a split type outer lamp holder sleeves the inner lamp holder; the outer lamp holder includes a first housing and a second housing which are buckled with each other. Furthermore, the first housing and the second housing are connected in a single-buckle manner, so that the outer lamp holder is replaceable and has high flexibility. The single-buckle design effectively improves the assembling efficiency of the outer lamp holder.

Abstract: The present disclosure discloses a light fixture, which includes a light body and elastic mounting members. The light body includes a light housing and a limiting element, the limiting element is connected to the light housing, a limiting space is enclosed by the light housing and the limiting element, one end of the limiting space is provided with a mounting opening, the limiting element has a matching notch, the matching notch is formed by extending from the mounting opening to an inside of the limiting element, and the light housing recesses to be provided with a limiting slot that communicates with the limiting space; and each elastic mounting member includes a clamping portion and a mounting portion, the clamping portion includes a base body and an elastic clip, the elastic clip is elastically connected to the base body.

Abstract: A mounting plate assembly has a mounting plate for mounting a light fixture in holes of different diameters. A guide rail assembly is secured to a rear face of the mounting plate on opposed sides of an aperture. Each guide rail assembly has a displaceable spring clamp structure mounted on a displaceable base coupled for sliding displacement along the guide rail assembly. Spring biasing elements are provided between the displaceable base and the guide rail assembly to urge a bottom face of the displaceable base against a flat top surface of a mounting base to which the guide rails are secured.

Abstract: An installable and dismantlable apparatus provided by the present invention includes: a load bearing part, a toggle assembly rotatably disposed on the load bearing part and a fixing assembly movably disposed on the load bearing part, and the fixing assembly is driven to move for fixing while the toggle assembly rotates. Through the use together of the load bearing part, the toggle assembly and the fixing assembly, while installed, the toggle assembly rotates and the fixing assembly is driven to move, and then the fixing assembly acts on another part for fixing; while dismantled, only the fixing assembly needs to be pushed towards its initial position, which not only ensures the convenience, reliability and firmness during the installation and fixation, but also saves manpower; and in practical use it is easy to operate and convenient for workers to install and dismantle quickly while ensuring the fixing effect.

Abstract: There is provided a light fixture comprising a light source. The light source has a housing terminating in a first end, and the housing has a housing connector proximate the first end. The housing also has a heat sink disposed inside the housing and a light emitter disposed inside the housing. The light emitter is positioned to allow a light emitted by the light emitter to exit the housing through the first end. The light source also has a connector in electrical communication with the light emitter. The housing connector is configured for reversibly securing the light source to one or more of: an adaptor reversibly securable to a trim configured for securing the light fixture to a substrate, and the trim.

Abstract: The invention relates to a vehicle headlamp (1) comprising a light source (2) and an add-on optical unit (3), wherein the light source (2) is fastened on a carrier (10), in which bores (12, 3) are provided in order to each receive a connection means (20, 21). A spacer element (30, 31) is arranged on the carrier (10). A holding bracket (40) is arranged on the spacer element (30, 31). The connection means (20, 21) is intended to connect the holding bracket (40) to the carrier (10) and is for this purpose inserted into a corresponding opening (41, 42) and into the corresponding bore (12, 13). In a first position of the holding bracket (40), in which the connection means (20, 21) is inserted into the opening (41, 42), but is not fixed, the holding bracket (40) can be moved relative to the connection means (20, 21) within the opening (41, 42) in a plane normal to an axis (22, 23) in order to allow the add-on optical unit (3) to be oriented relative to the light source (2) in the plane.

Abstract: The present invention relates to the technical field of fixing equipment, more specifically, to a fixing device for installing electronic equipment on a plate. The fixing device included a mounting cylinder and a fixing plate arranged around its top of the mounting cylinder; the mounting cylinder and the fixing plate are respectively provided with a number of pairs of clamping assemblies and pressing assemblies, respectively; the fixing device clamps the plate between the fixing plate and the clamping assemblies, thereby installing the electronic equipment on the plate. The fixing device in the present invention can fix the electronic equipment, it only needs to be manually installed in the mounting cylinder and then clamped between the fixing plate and the clamping assemblies, so that the whole process has less manpower participation and simple operation. It is convenient, fast, fixed and stable, and has high practicability.

Abstract: A sealed luminaire includes a light engine that has a housing assembly that defines a light emitting opening and a lightguide that is disposed in the housing assembly. The lightguide is configured to receive light from a light source through an edge thereof and emit the light through a major surface thereof and the light emitting opening. Further, the sealed luminaire includes a sealing assembly. The sealing assembly includes a protective lens that is coupled to the housing assembly of the sealed luminaire such that the protective lens covers the light emitting opening, and a gasket that is coupled to the protective lens. A mounting bracket is configured to mount the sealed luminaire in a mounting structure such that the sealed luminaire is clamped between the mounting bracket and the mounting structure and the gasket creates a seal between the sealed luminaire and the mounting structure.

Abstract: An adjustable luminaire can include an upper body rotatably attached to an intermediate body. The upper body can contain a light module have an upper wall of varying height. The intermediate body can have an intermediate wall of varying height and the upper body and intermediate body can be rotatably attached so that rotating the upper body adjusts the angle at which light from the light module is emitted from the adjustable luminaire.

Abstract: A ceiling light fixture includes a mounting bracket, two retaining members pivotally mounted on two ends of the mounting bracket respectively, a light module mounted on the mounting bracket, and an outer disk mounted on the light module. The light module is retained by the two retaining members. The light module is provided with two connecting portions and a plurality of locking members. Each of the two connecting portions is provided with two retaining grooves locked onto one of the two retaining members. The outer disk is provided with a plurality of elastic plates. Each of the elastic plates of the outer disk is locked onto one of the locking members of the light module.

Abstract: A lamp has a lamp body assembly, a positioning frame assembly surrounding the periphery of the lamp body assembly for assembling the lamp body assembly to the fixture, the lamp body assembly is detachably assembled with the positioning frame assembly. The invention has the advantages of simple structure, low cost, convenient maintenance and can meet different requirements of lighting effect.

Abstract: A downlight apparatus is designed to be installed in a cavity of a ceiling. The downlight apparatus includes a base part, a major part and a connector. The base part has a shape to be fixed in the cavity of the ceiling. The base part has a base housing for defining a through hole and a light window. The major part includes a major housing, a light source and a driver circuit. The connector connects the major housing and the base housing. The connector provides multiple candidate positions for a user to configure to change a relative position of the base part and the major part so as to change an output light defined determined by the light window and the light source.

Abstract: A device for directing light is provided. The device includes at least two light modules adapted to provide a fixture for a light source. The at least two light modules are linear, parallel to a central axis, substantially in a plane with the central axis, and arranged on both sides of the central axis in the plane. A first inner endcap is provided that is arranged on a first end of the at least two light modules and a second inner endcap is provided that is arranged on a second end of the at least two light modules. The first end opposes the second end along a length of the at least two light modules. The first and second inner endcaps provide a fixed, rotational axis for one of the light modules, and provide two locking positions to determine a rotational position for the light module.

Abstract: A method and system for providing an improved recessed luminaire includes providing the ability to rotate or shift the position of the junction box within the system. The improved system also provides an ability to shorten lengths of the hanger bar assemblies in an efficient manner during installation of the luminaire. A geometry of the end of the hangar bar assemblies may be modified to provide a more efficient design that also helps support fasteners. Additional improvements may include those for a spring to lock a door of the junction box; improvements for locking hanger bars to a plaster plate; improved mounting tabs for the plaster plate; an improved thermal protector case with enhanced coupling mechanisms; and improvements to a spring for locking a door of the junction box that improve compactness for the system to aid in shipping the system.

Abstract: In accordance with various embodiments, lighting systems features one or more inter-connectable light panels each having multiple light-emitting elements thereon. One or more of the light panels may feature one or more connectors, and associated conductors, for the transmission of power, communication signals, and/or control signals. One or more of the light panels may include sound-absorbing material therebelow and may define one or more apertures that reveal the sound-absorbing material.

Abstract: A false ceiling comprising a bearing structure comprising at least two coplanar and mutually parallel opposite profile members fixed to a ceiling, the profile members between them defining an access opening providing access to the ceiling, each profile member comprising a shoulder defining a horizontal bearing surface facing towards the ceiling, at least one panel positioned between the profile members, the panel being dimensioned to rest on the bearing surface of the profile members, the false ceiling further comprising removable and attached wedging means for transversely wedging the panel between two opposite profile members, the wedging means being arranged on either side of the panel.

Abstract: The invention provides an elongated lighting element (200) for attachment to a building part (10) selected from the group consisting of a wall (11), a ceiling (12) and a floor (13), wherein the building part (10) comprises a first attachment unit (131) and a first electrical power connector (141), wherein the elongated lighting element has a front side (210) and at the other side of the front side (210) (i) a second attachment unit (231) for forming with the first attachment unit (131) said attachment to said building part (10), (ii) a second electrical power connector (241) for forming an electrical connection with the first electrical power connector (141), and (iii) a plurality of solid state based light sources (250) configured to provide light source light (251) and functionally connected with the second electrical power connector (241).

Abstract: A friction blade trim retention system is disclosed. The friction blade trim retention system uses friction blades that are biased radially outward to engage the interior wall of a can housing to hold a trim assembly of a recessed light fixture therein. The system includes vertical translating components that include spring biased detents to toggle between an upper position and a lower position. The detent lower position allows the installer to install the friction blade inside the can in a first step. The installer in the second step pushes the trim assembly upward into the can to engage the upper detent, thus completing installation.

Abstract: A luminaire that includes a heat spreader, a heat sink diametrically outboard of the heat spreader, an optic retained by the heat spreader, a light source disposed on the front side of the heat spreader, and a power conditioner disposed on the heat spreader. The power conditioner is disposed on the same side of the heat spreader as the light source. The heat sink includes fins that alternate with adjacently disposed and radially oriented recesses.

Abstract: A recessed lighting fixture for installation in an inclined ceiling has an enclosure and a lighting assembly pivotal relative to the enclosure through a first and second range of relative angles such that an optical axis can be aligned vertically for the first and second ranges. First and second trim element are adapted for use with the first and second ranges of inclinations. The first and second trim elements have optical element aligned at different angles, and a relative angle between the optical elements and the reflector plane is less than or equal to 10 degrees. An angle indicator provides a proper relative angle of the lighting assembly and a trim indicator provides an indication of a proper trim element.

Abstract: A housing has a sidewall that surrounds an interior cavity that has an open rear end and an open front end, and is divided by a partition into a top cavity and a bottom cavity. The top cavity extends to the open rear end, the bottom cavity extends to the open front end. A power supply circuit board is inside the top cavity, while a light source is inside the bottom cavity and emits light through the open front end to illuminate a room. First wires pass through an opening in the partition, and are coupled to the power supply circuit board at one end and to the light source at another end, to deliver power to the light source. A lid or cover covers the open rear end enclosing the top cavity, and is secured to the housing. Other embodiments are also described and claimed.

Abstract: The recessed lighting fixture includes a light source module and a driver housed within a unified casting, and within a shared outer casing. The outer casing may be coupled to a hangar holder that is movably coupled to a corresponding hangar bar. The outer casing, including the light source module and driver installed therein, may move both 1) in the length direction of the hangar bar and 2) perpendicular to the length direction of the hangar bar. The recessed lighting fixture may have less bulk and size than traditional recessed lighting fixtures. Other embodiments are also described and claimed.

Abstract: A lighting fixture includes a light source, a housing coupled to the light source, a light sensor, and a sensor cover over the light sensor and coupled to the housing. The housing includes an opening through which light generated by the light source is emitted towards an area of interest, and an exposed surface that reflects light such that the housing appears at a first color. The sensor cover includes a front surface that reflects light such that the sensor cover appears at a second color, which is substantially similar to the first color, and has an average transmittance greater than 10% within a desired wavelength band. By providing the sensor cover with the reflectance and average transmittance as described, a functional sensor cover that aesthetically blends with a lighting fixture is achieved.

Abstract: A recessed lighting fixture comprises a generally annular body having a central cavity in the form of a partially spherical socket. There is a lighting support member having a partially spherical exterior portion which is closely fitted within the partially spherical socket of the annular body. The lighting support member is pivotable relative to the annular body, but air flow between the partially spherical socket of the annular body and the partially spherical exterior portion of the lighting support member is substantially restricted. There may be a light source mounted to the lighting support member adjacent a bottom thereof. The light source may be a light-emitting diode.

Abstract: A lamp includes a rotary adjustment mechanism, an inclination adjustment mechanism and a light source. The light source is rotatable along a first direction in a first plane by the rotary adjustment mechanism and/or rotatable relative along a second direction in a second plane by the inclination adjustment mechanism, wherein the second plane is different from the first plane.

Abstract: An automatic lamp installation mechanism includes a support element having one end of rotatably connected to a side of a fixing base; an elastic element arranged between the support element and the fixing base, a fixing element provided on the support element and including a first catch element; and a limiting element provided on the side of the fixing base and having a triggering element and a second catch element, wherein the triggering element is located apart from the fixing base.

Abstract: A vehicle lamp includes a condenser lens with a focal plane and an optical axis, a heat-dissipation base disposed at a side of the condenser lens such that the focal plane is disposed between the condenser lens and the heat-dissipation base, a first light source disposed on the heat-dissipation base with a first light-emitting surface facing the focal plane, a reflector disposed on the heat-dissipation base and having a plurality of ellipsoidal surfaces with at least one of the two focal points of each of the ellipsoidal surfaces located on the focal plane, and a second light source disposed on the heat-dissipation base with a substrate and second light-emitting surfaces disposed on the substrate facing the reflector.

Abstract: A sensor module for a lighting fixture includes a light sensor and a sensor cover over the light sensor. The sensor cover includes a front surface and a light focusing surface opposite the front surface. The front surface is configured to face an area of interest that is generally illuminated by the lighting fixture. The light focusing surface is opposite the front surface and includes a number of lens sections, each of which is configured to focus light from a different portion of the area of interest toward the light sensor. By including a number of lens sections each focusing light from a different portion of the area of interest, a relatively large area of interest can be observed while maintaining desirable aesthetics of the sensor module.

Abstract: A light fixture includes a fixture body, a support structure, a plurality of light emitting diodes (LEDs) a driver, a cover, and a connector. The fixture body includes a first raceway, a second raceway, and a channel. The second raceway is substantially parallel to the first raceway. The channel is coupled to the first raceway and the second raceway such that the channel is substantially orthogonal to the first raceway and the second raceway. The support structure is coupled to the first raceway and the second raceway. The plurality of LEDs is coupled to the support structure and spaced apart along a length of the support structure between the first raceway and the second raceway. The driver is positioned within the channel and electrically coupled to the plurality of LEDs. The cover is detachably coupled to the channel and extends from the first raceway to the second raceway.

Abstract: A support ring is for mounting of a soft box on a light source. The support ring includes a connector for attachment of the support ring to the light source, and at least one cavity configured to receive support pins of the soft box. The cavity further includes a first and a second support element arranged to counteract a torque from the support pins, when the support pins are in an inserted position in the cavity. At least one entry element on a radial outside of the cavity is arranged to counteract a force required to bend the support pin to an angle where the support pin can be inserted into the cavity.

Abstract: A light fixture which is configured to be embedded in a surface is provided. The light fixture includes a light source and a front panel located in front of the light source. A frame is in contact with a front panel surface of the front panel. A pressure mechanism is configured to press the front panel surface against the frame. A fixing piece is provided at a position opposite to the front panel. The fixing piece extends outward from the base surface side to fix the frame to an external structure. The pressure mechanism is retractable by a distance greater than a thickness of the front panel when a pushing force is applied to the front panel surface. The front panel is movable in a direction perpendicular to a retractable direction of the pressure mechanism when the pressure mechanism is retracted.

Abstract: An LED lamp, integrated to electric fan, comprising at least one flat LED lamp that comprises a light box containing, light diffuser, light reflector, multiplicity of packaged LEDs, heat sink, vent holes and printed circuit board, is powered by a programmable LED driver unit. The lamp employs multiplicity of packaged LEDs as a source for generating visible light for illumination. The LED lamp can be made in any shape and size and can be integrated to the electric fan at the front side or back side of the fan. The programmable driver unit can be programmed to apply desired ratio of power to RGB LEDs to generate various colors of light and hues of colors of light from the LED lamp containing multiplicity of packaged RGB LEDs. The program can be adjusted to generate various colors of light and hues of colors of light from the LED lamp depending on the time of the day or night.

Abstract: A lighting module for a recessed light fixture has a housing and a light module body movably coupled to the housing by a linkage. In an intermediate tilted position, an optical axis of the light module body is aligned at a first angle relative to a Y axis, and in a fully-tilted limit position, the optical axis is aligned at a second angle relative to the Y axis. Movement of the light module body relative to the housing includes rotation about a Z axis and translation parallel to X and Y axes. During movement of the light module body relative to the housing a first lateral section of a peripheral edge defining an opening of the light module body remains substantially parallel to the Z axis and maintains a substantially constant perpendicular distance from the X axis.

Abstract: The invention is directed at a modular lighting, detection and control system (1) for an industrial construction or a vehicle service construction comprising an assembly of one or more suspension rails (3) and one or more system modules (7), wherein the suspension rails (3) are arranged for receiving the system modules (7), and the system modules (7) are arranged for mounting thereof on the suspension rails (3) for suspending therefrom, and wherein the system is arranged conveying electric signals to and/or from the modules (7) via the suspension rails (3), said electric signals including a power signal for powering the system modules (7), wherein the system further comprises a low voltage power supply unit for providing the power signal, the power signal being a low voltage electrical power signal, and wherein for conveying the electric signals the suspension rails (3) comprise one or more conductor sections (12,13,14,15), wherein the conductor sections (12,13,14,15) are formed of a conductive material subst

Abstract: An assembly for mounting a light fixture in a hole in a ceiling panel and including an annular trim ring that's held upward against a lower surface of a ceiling panel by the light fixture to be mounted, such that the trim ring spans an annular gap between such light fixture and the ceiling panel hole. A top plate is carried by the ceiling panel across the ceiling panel hole and includes a top plate hole that receives the light fixture to be mounted such that the top plate spans an annular gap between the light fixture and the ceiling panel hole. A mount supports the light fixture on the top plate in a position holding the trim ring up against the lower surface of the ceiling panel.

Abstract: A LED light fixture is disclosed with an adjustable mounting mechanism. The adjustable mounting mechanism includes lever features that are mechanically coupled to the adjustable flanges. The lever features ratchet or move downward to sandwich portions of a ceiling that surround a ceiling recess hole between the adjustable flanges and the lever features to secure the LED light fixture within the ceiling recess hole. The LED light fixture also includes a power source with a dimmer switch that allows DC power output from the power unit to be adjusted and dim light output emitted from the LED light fixture.

Abstract: The invention relates to a light fixture (1) comprising an elongated carrier element (5), a number of lighting modules (20), which can be detachably secured to the carrier element (5), and means for supplying power to the lighting module (20), said means comprising an operating device (100) and contacting means (40, 41) which are connected to said operating device (100) and to which the lighting modules (20) can be electrically connected. In said light fixture, the operating device (100) and the contacting means (40, 41) are arranged on a device carrier (50) that can be detachably secured to the carrier element (5).

Abstract: A lamp includes a rotary adjustment mechanism, an inclination adjustment mechanism and a light source. The light source is rotatable along a first direction in a first plane by the rotary adjustment mechanism and/or rotatable relative along a second direction in a second plane by the inclination adjustment mechanism, wherein the second plane is different from the first plane.

Abstract: Embodiments relate generally to systems and methods for treating passenger transportation vehicle cabin surfaces and surrounding air. The methods may use organic LEDs to produce ultraviolet light. Systems may be provided to ensure safety and operation of the air treatment only when passengers and personnel are not present in the cabin.

Abstract: The invention relates to a reading lamp for installation in a cabin trim element (4) of a vehicle, in particular of an aircraft, comprising an installation frame (1) having a ring element (2), a lamp housing (7) having a mating support surface (8), and a clamping ring (9) wherein the clamping ring (9) is connected to the installation frame (1) by means of tension spring elements (10), such that the lamp housing (7) is forced against the support surface (6) of the inner surface of the ring element (2) by means of the clamping ring (9) and may be moved with respect to the installation frame (1) in the manner of a ball and socket joint.

Abstract: An optical assembly includes a first reflector having a reflective surface with a first lateral extent, and a second reflector having a reflective surface with a smaller, second lateral extent. The second reflector is disposed such that the second reflective surface opposes the first reflective surface with a space therebetween. A light emitter couples with the first reflector such that the light emitter emits light along a central axis, away from the first reflector and toward the second reflector. A translucent diffuser substantially spans the space between the first and second reflectors. A majority of the light emitted by the light emitter reflects from the first and second reflectors, and impinges on and passes through the diffuser. A luminaire that includes the optical assembly also includes an outer shell having a form that is analogous to a shape of the diffuser of the optical assembly.

Abstract: A bracket can connect a luminaire to a junction box or other housing or structure, for example at a ceiling. The bracket can be mounted to the junction box using one or more fasteners. The bracket can comprise two tabs, and the luminaire can comprise two corresponding slots. Alternatively, the bracket can comprise two slots, and the luminaire two corresponding tabs. The luminaire can be attached to the bracket by positioning the luminaire so that the two tabs are inserted into the two slots and rotating the luminaire so the slots and tabs engage and lock.

Abstract: A mounting system for a recessed luminaire includes an upper frame 200 to fit within a cutout opening 141 in a ceiling 140, including pivotally mounted support levers 202 to overlap the upper surface of the ceiling. A lower frame 210 fits within the opening and has a trim face 220 that is configured to abut against the room-side surface of the ceiling. Clamping screws 212 fasten the lower frame to the upper frame and are adjustable to clamp varying thicknesses of ceilings between the support levers and the trim face when the screws are tightened. Fasteners 132 fasten a luminaire 100 to the lower frame, which is installed through the lower and upper frames, from the room-side of the ceiling. The mounting system and luminaire may be completely installed from below a ceiling that has limited space above the ceiling or when access above the ceiling is not available.

Abstract: A light fixture including a support structure and a plurality of LEDs coupled to the structure and spaced apart along at least a portion of a length of the structure. The light fixture further includes a power pack, the power pack including a driver configured to be electrically coupled to the plurality of LEDs, power input wiring that is configured to receive power for the light fixture, and a cover provided substantially over the driver and the power input wiring. A modular power input connector is accessible without removing the cover, wherein the modular power input connector is coupled to the power input wiring, and wherein the modular power input connector is configured to accept a power cord.

Abstract: An adjustable recessed trim for a lighting fixture includes an enclosure with a light output opening and a light source opening provided upward from the light output opening. An adjustable cover piece having a cover piece light source opening is provided over the enclosure in registration with the enclosure light source opening and is adjustable between at least a first position and a second position.

Abstract: Improvements in a fixture housing with dog ears is disclosed that can be installed from one side of a wall or ceiling. This increases the ability of the installer to place the fixture in a desired location as opposed to using a location that provides the best access on stud or joists. Once the ideal location is identified the installer uses a saw to cut an opening in the desired location. The housing is pushed into the opening for installation without requiring access to the back of the wall, ceiling or floor. The fixture housing uses a plurality of spring loaded dogs that are operated from the visible wall or ceiling surface. It is also possible for the fixture to be removed by lifting the locking tabs and sliding securing ears where the entire fixture can then be pulled back through the open hole.

Abstract: A light fixture is provided with a light seat including four spaced, upward inclined sides and holes arranged along a bottom edge of each side, insulators fastened in the holes respectively, LED arrays each including LEDs, and wires each passing through the hole to interconnect a power source and the LED array; a lampshade secured to the light seat; and a centrally raised cover comprising a threaded fastening assembly for securing the cover to the light seat, and through holes disposed along edges as heat sinks which are in close proximity to a predetermined number of the LED arrays.

Abstract: A rectangular panel for a suspended ceiling, the panel having a suspension spring with two divergent arms at each of two opposed panel edges mounted on a rear side of the panel, each spring being mounted on the panel in an arrangement permitting the arms to lie parallel to a front face of a panel, project rearwardly perpendicular to the front face and to lie outside of the panel parallel to the front face, the spring mounting arrangement enabling the spring to be maintained in the rearward orientation by a force developed by the spring with its arms confined and locator elements for registering the panel with grid members of the ceiling.