A uniform luminance light-emitting diode (LED) circuit board includes a first primary trace and a second primary trace mounted on a substrate along a direction and are spaced apart, multiple LED strings mounted on the substrate along the direction and parallelly connected between the first primary trace and the second primary trace, a first power trace and a second power trace respectively connected to the first primary trace and the second primary trace, and a first auxiliary trace with two ends respectively connected to the second primary trace and the second power trace. By adjusting trace widths of the first primary trace and the second primary trace to limit current passing through each LED string and using the first auxiliary trace to provide an additional current path, identical current flowing through all the LED strings results in uniform luminance of the LED strings.

Disclosed is an LED luminaire, comprising a housing positionable at a building structure location. The housing has at least one light output boundary and configured to direct light therein toward the light output boundary. A light guide configured to be located at the light output boundary to receive light operationally contained within the housing, so as to emit non-directional light at the light output boundary. At least one first LED light engine is located within the housing, the at least one first LED light engine including at least one first LED light source to emit directional light at the light output boundary.

A lighting system comprising a track having a first and a second rail (5, 7), mutually extending equidistantly. Said first and second rail comprise a first respectively a second electrically conductive strip, mutually electrically isolated. A lighting module (17) comprising a first and second electrical contact, which lighting module in mounted position rests by gravitational force on the first and second rail. When mounted the first and second electrical contact are in electrical contact with a respective one of the first and second electrically conductive strip. The lighting module is dismountable from the track by a single displacement of the lighting module in a direction against the direction of the gravitational force.

A lamp, comprising at least one light source (3), arranged in a housing (1) having at least one light exit opening, and at least one reflector (4), which is shaped in such a way that the light coming from the light source (3) is divided into at least two light beams, the light exit opening being at least partially covered by a cover panel (5), which has two surface portions (5a, 5b) on which the respectively corresponding light beams impinge, the surface portions (5a, 5b) being shaped in such a way that the predominant part of the light beams that is respectively directed onto a surface portion (5a, 5b) impinges on the surface portion (5a, 5b) at an angle of incidence which is less than 60°, in order to reduce the reflections from the cover panel (5).

Lighting devices and methods utilize multiple independently controllable groups of solid state light emitters of different dominant wavelengths, with operation of the emitter groups being automatically adjusted by processor(s) to provide desired illumination. Operation of the emitter groups may be further affected by sensors and/or user input commands (e.g., sound patterns, gesture patterns, or signal transmission). Operation may be adjusted to compensate for presence, absence, intensity, and/or color point of ambient or incident light. Presence of five or more groups of solid state light emitters provide desirable luminous flux, color point, correlated color temperature (CCT), color rendering index (CRI), CRI R9, and luminous efficacy characteristics of aggregate emissions over a wide range of CCT values, and may permit adjustment of vividness (e.g., relative gamut) and/or melatonin suppression characteristics for a selected color point or CCT.

A light guide plate supported by at least one frame. An LED module is arranged on at least one side of the light guide plate, and a power input module is supported by at least one frame. When power is applied by the power input module, LED elements of the LED module emit light, and light emitted by the LED module is emitted through the light guide plate.

A light-emitting device includes a strip-like high flexibility region and a strip-like low flexibility region arranged alternately in a direction. The high flexibility region includes a flexible light-emitting panel. The low flexibility region includes the light-emitting panel and a support panel having a lower flexibility than that of the light-emitting panel and overlapping with the light-emitting panel. It is preferable that the light-emitting panel include an external connection electrode and that a length in the direction of a low flexibility region A that overlaps with the external connection electrode be longer than a length in the direction of a low flexibility region B that is closest to the region A.

Light fixture embodiments for direct downlighting applications provide benefits of low overall fixture profile height, increased light output, enhanced uniformity of brightness and color by use of novel edge-lit optical elements that functions simultaneously as a diffuser and direct throughput lens, as well as an outcoupling TIR light guide. The light fixture can provide low-glare ambient light or more directional wall wash, task and accent lighting. The light fixture typically comprises a 3-dimensional extruded linear support body which retains and aligns LED boards, reflectors and edge-lit optical elements, such as a diffuser or light guide. The edge-lit design 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. Embodiments are provided that comprise mounting of the light fixture into a ceiling grid using clips or mounting hardware as well as end plates without impacting the plenum requirements. Provided are typical benefits of an edge-lit light guide design including shallow depth, extended emitting area, and off axis light distributions such as asymmetric and symmetric batwing distributions particularly useful in downlighting and other lighting applications. Additionally, area dedicated to bezels or edge reflectors can greatly improve appearance due to reduced or eliminated hotspotting and bright edges to provide a fixture face with very high percentage of light emitting area. Further embodiments are included that may be surface mounted in a cove lighting arrangement or suspended hanging from a T-bar in a suspended wood panel ceiling system. Examples are also provided of the light fixture used in ceiling grid systems incorporating drywall panels.

A lighting assembly including a shell, wherein the shell includes an inner wall defining an inner lumen, an outer wall encircling the inner wall, a set of radial fins connecting the inner and outer walls, the set of fins cooperatively defining a set of cooling channels between adjacent fins, the inner wall, and the outer wall; an insert removably mounted within the inner lumen, the insert defining a power storage lumen; a power storage unit arranged within the power storage lumen; a circuit board coupled to the power storage unit, the circuit board comprising a processor and communication module; a lighting module electrically connected to the circuit board, wherein the lighting module includes a substrate and a set of light emitting elements mounted to a first broad face of the substrate.

A light emitting diode (LED) flat panel lighting fixture is provided. The LED flat panel lighting fixture comprises an LED flat panel lighting device comprising (a) one or more LEDs and (b) one or more first mating mechanisms. The LED flat panel lighting fixture further comprises a mounting bracket comprising one or more second mating mechanisms configured to each mate with a corresponding one of the one or more first mating mechanisms when the LED flat panel lighting device is rotated within the mounting bracket and with respect to the mounting bracket. The rotation of the LED flat panel lighting device within a plane of the mounting bracket and with respect to the mounting bracket causes the mating of the one or more second mating mechanisms with the corresponding ones of the one or more first mating mechanisms.