Abstract: A lighting arrangement can include a light emitter portion and a battery backup portion. The light emitter portion can have a plurality of light emitting diodes and circuitry for driving the plurality of light emitting diodes including a rectifier and an IC chip configured to drive the plurality of light emitting diodes with the rectified voltage provided by the rectifier. The battery backup portion can be in electronic communication with the light emitter portion and can have a battery portion with one or more batteries and a converter portion with a DC-AC inverter downstream of the one or more batteries that directs the electrical power to the rectifier and is driven by the one or batteries.

Abstract: A lighting arrangement can include a luminaire and a first plurality of spring arms. The luminaire can include a housing assembly and a light emitter portion at least partially enclosing the light emitter portion. The first plurality of spring arms can each be engageable with the luminaire and extend from a respective base end to a respective distal end. The base ends can be positioned closer to the housing assembly than the distal ends. Each of the first plurality of spring arms can extend vertically upward and away from the housing assembly along the axis such that the base ends are vertically lower than the distal ends. Each of the first plurality of spring arms can extend along a torturous path and be cantilevered off of the housing assembly.

Abstract: A lighting arrangement can include a casing, a mounting bracket, a plurality of light emitting diodes, and a driving circuit. The casing can have a perimeter wall extending about a central axis and bottom lip projecting from the perimeter wall. The mounting bracket can be configured to be affixed to a ceiling. A cavity can be defined vertically between the bottom lip and the mounting bracket and defined radially by the perimeter wall. The driving circuit can be configured to power the plurality of light emitting diodes with AC power. The driving circuit can be transformer-less and include a powering circuit portion electronically communicating with the plurality of light emitting diodes. The driving circuit is disposed in the cavity.

Abstract: A lighting arrangement can include a light panel, a bracket, and a connecting member. The light panel can include a frame and a plurality of light emitting units. The bracket can be mountable on at least one of a wall and a ceiling. The frame of the light panel and the bracket can be selectively engageable with one another through movement of the light panel relative to the bracket along a path of movement in a direction between first and second positions. The connecting member can be fixedly engaged to the light panel or the bracket. The connecting member can be configured to interconnect the light panel and the bracket and to accumulate energy during movement of the frame along the path wherein the accumulated energy is at least partially released upon the light panel reaching the second position.

Abstract: A lighting arrangement can include a mounting ring, a luminaire, locking arms, and posts. The mounting ring can extend along a central longitudinal axis. The luminaire can have a housing assembly and a light emitter. The locking arms can each include a circumferential portion extending about the central longitudinal axis. The circumferential portions can each extend from a first end to a second end distal relative to the first end and each can have an upper face and a lower face. The mounting ring and the luminaire can be interconnected by moving the posts past the second ends along the central longitudinal axis, rotating the mounting ring and the luminaire relative to one another about the central longitudinal axis to slide the posts along one of the upper and lower faces.

Abstract: A lighting arrangement can include a light emitter portion and a battery backup portion. The light emitter portion can have a plurality of light emitting diodes and circuitry for driving the plurality of light emitting diodes including a rectifier and an IC chip configured to drive the plurality of light emitting diodes with the rectified voltage provided by the rectifier. The battery backup portion can be in electronic communication with the light emitter portion and can have a battery portion with one or more batteries and a converter portion with a DC-AC inverter downstream of the one or more batteries that directs the electrical power to the rectifier and is driven by the one or batteries.

Abstract: The invention relates to applications of optical interference. It is already known to reduce speckle contrast by introducing arbitrary phase shifts in the reference light beam. According to the invention, such phase shifts are not introduced arbitrarily, but systematically whereby the phase changes are synchronised with the acquisition time intervals in such a way that interference fringes can be washed out in selected regions of the beam diameter maintaining high contrast of interference fringes in the desired regions at the same time. This technique can be used for enhancing the lateral resolution in imaging techniques and the bandwidth in optical communications.

Abstract: A lighting arrangement can include a casing, a mounting bracket, a plurality of light emitting diodes, and a driving circuit. The casing can have a perimeter wall extending about a central axis and bottom lip projecting from the perimeter wall. The mounting bracket can be configured to be affixed to a ceiling. A cavity can be defined vertically between the bottom lip and the mounting bracket and defined radially by the perimeter wall. The driving circuit can be configured to power the plurality of light emitting diodes with AC power. The driving circuit can be transformer-less and include a powering circuit portion electronically communicating with the plurality of light emitting diodes. The driving circuit is disposed in the cavity.

Abstract: A lighting arrangement can include a mounting ring and a luminaire. The mounting ring can extend along a central longitudinal axis and have a plurality of tabs, a circular wall, and a plurality of locking arms. Each of the plurality of tabs can define a mounting aperture and the circular wall can interconnect the plurality of tabs. Each of the plurality of locking arms can project from the circular wall and include a circumferential portion extending about the axis. The luminaire can have a housing assembly and a light emitter and a plurality of posts. The mounting ring and the luminaire can be interconnected by moving the posts past distal ends of the locking arms along the axis and then rotating the mounting ring and the luminaire relative to one another in a first angular direction about the axis.