A structural light fixture for the ceiling of clean room, such as a clean room for pharmaceutical or electronic research or production, includes an outer U-shaped beam and an inner U-shaped beam. The inner U-shaped beam nests within the outer U-shaped beam. The inner and outer U-shaped beams are mutually reinforcing so that the combination of the two U-shaped beams is stronger and stiffer than either U-shaped beam alone. The top side of the outer U-shaped beam is exposed to the outside of the clean room and includes no perforations so that the outer U-shaped beam is a barrier to gas, particulates, microorganisms or disinfectants that otherwise would pass through the clean room ceiling. The removable inner U-shaped beam includes a lamp and power supply, allowing maintenance of the structural light fixture from the interior of the clean room without interrupting the barrier to contamination created by the structural light fixture.

A ceiling lamp, including a chassis, a frame assembly and an assembling assembly; the chassis is provided with an abutting surface bonded to a ceiling, and the frame assembly is detachably connected to the chassis in a vertical direction by the assembling assembly; the assembling assembly includes a first assembling member and a second assembling member, one of the first assembling member and the second assembling member is arranged on the chassis, and the other assembling member is correspondingly arranged on the frame assembly; a snap-fit groove is arranged in a side surface parallel to the vertical direction of the snap-fit main body, the snap-fit member is slidably arranged on the sliding base and is capable of protruding out of the sliding base to extend into the snap-fit groove, and the elastic element supplies an elastic pushing force for the snap-fit member to extend into the snap-fit groove.

A ceiling lamp, including a chassis, a frame assembly and an assembling assembly; the chassis is provided with an abutting surface bonded to a ceiling, and the frame assembly is detachably connected to the chassis in a vertical direction by the assembling assembly; the assembling assembly includes a first assembling member and a second assembling member, one of the first assembling member and the second assembling member is arranged on the chassis, and the other assembling member is correspondingly arranged on the frame assembly; a snap-fit groove is arranged in a side surface parallel to the vertical direction of the snap-fit main body, the snap-fit member is slidably arranged on the sliding base and is capable of protruding out of the sliding base to extend into the snap-fit groove, and the elastic element supplies an elastic pushing force for the snap-fit member to extend into the snap-fit groove.

An optical member includes a curved portion comprising an optically transmissive material. The enclosure has an outer surface and an inner surface opposite the outer surface. At least one light redirection feature protrudes from the inner surface. At least one indentation defined on the outer surface is configured to refract light.

A lighting system is disclosed herein. The lighting system can include light module for surface, recessed or pendant mounting. The module can include a channel having side walls and an open top and can extend between first and second ends. The module can also include an array of light emitting diodes disposed in the channel and a driver for controlling the light emitting diodes. The module can also include a lens mountable in the open top and a cap selectively engageable with at least one of the first and second ends. The cap can be removed from one of the ends when the module is interconnected with a second light module. The system can also include any one or more of a linking bracket, a positioning bracket assembly, tools for assembling the lens to the channel, and a control module.

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.

There is presented a lighting device comprising: several light-emitting filaments (15, 15′) with solid-state light sources and a circuit board (10) with first and second electrically conductive tracks (13, 14) following first and second paths, respectively. Each light-emitting filament (15, 15′) comprises a first electrical contact (19, 19′) electrically connected to the first track (13) at a first point on the first path, and a second electrical contact (20, 20′) electrically connected to the second track (14) at a second point on the second path. The first and second points associated with each light-emitting filament (15, 15′) are arranged on an axis (A) which is non-perpendicular to a tangent (T.sub.1) to the first path at the first point and to a tangent (T.sub.2) to the second path at the second point. The lighting device may be adapted to emit light from what appears to be a surface according to an observer.

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 and/or cut-out regions that reveal the sound-absorbing material.

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 and/or cut-out regions that reveal the sound-absorbing material.

A frame structure for ceiling lighting device is provided, which includes a plurality of first frame bars, a plurality of second frame bars and a plurality of corner braces. Each first frame bar includes a first frame bar body and a first chamber structure disposed on one side of the first frame bar body. Each second frame bar includes a second frame bar body and a second chamber structure disposed on one side of the second frame bar body. Each corner brace includes a first extension arm inserted into an opening at one end of the first chamber structure of one of the first frame bars and a second extension arm inserted into the opening at one end of the second chamber structure of one of the second frame bars, such that the first frame bars and the second frame bars can be combined with each other.