An optical article for illuminating building interiors including a reflective grid panel, an LED light source positioned above the reflective grid panel and configured to illuminate the reflective grid panel at incidence angles ranging from a minimum angle of 0° to a maximum angle of at least 45°, a light diffusing sheet of an optically transmissive dielectric material approximately coextensive with and oriented generally parallel to the reflective grid panel, and a pair of reflective side walls flanking a space between the reflective grid panel and the light diffusing sheet. The reflective grid panel incorporates a plurality of parallel longitudinal walls and a plurality of parallel transverse walls joining the walls and defining a plurality of rectangular openings configured to transmit light. Each of the parallel transverse walls extends transversely with respect to a plane of the reflective panel and is configured to diffusely reflect a portion of the light being transmitted through the plurality of rectangular openings.

An optical article for illuminating building interiors including a reflective grid panel, an LED light source positioned above the reflective grid panel and configured to illuminate the reflective grid panel at incidence angles ranging from a minimum angle of 0° to a maximum angle of at least 45°, a light diffusing sheet of an optically transmissive dielectric material approximately coextensive with and oriented generally parallel to the reflective grid panel, and a pair of reflective side walls flanking a space between the reflective grid panel and the light diffusing sheet. The reflective grid panel incorporates a plurality of parallel longitudinal walls and a plurality of parallel transverse walls joining the walls and defining a plurality of rectangular openings configured to transmit light. Each of the parallel transverse walls extends transversely with respect to a plane of the reflective panel and is configured to diffusely reflect a portion of the light being transmitted through the plurality of rectangular openings.

The purpose of the present invention is to realize a lighting device of small light distribution angle and less leakage light and further to realize a lighting device in which the light beam is easy to control. The following is an example of the structure to meet the above purpose. A lighting device including: a light guide; LEDs set at a side surface of the light guide; a prism sheet set on a major surface of the light guide, in which a first louver which extends in a first direction and, a second louver which extends in an orthogonal direction to the first direction are superposed on the prism sheet.

The purpose of the present invention is to realize a lighting device of small light distribution angle and less leakage light and further to realize a lighting device in which the light beam is easy to control. The following is an example of the structure to meet the above purpose. A lighting device including: a light guide; LEDs set at a side surface of the light guide; a prism sheet set on a major surface of the light guide, in which a first louver which extends in a first direction and, a second louver which extends in an orthogonal direction to the first direction are superposed on the prism sheet.

A louvred lighting fixture comprising a lighting assembly and a louvre assembly. The lighting assembly comprises a lighting arm having a light emitting device. The louvre assembly comprises an outer louvre 19 and an inner louvre. The louvred lighting fixture 1 has an axis of rotation X-X, wherein the lighting arm, the outer louvre and the inner louvre each have a longitudinal axis of rotation that is coaxial with the axis of rotation X-X, so that, in use, the outer louvre and the inner louvre are rotated so that the forward light obscuring region and the rearward light obscuring region can be positioned within the beam of light emitted by the light emitting device.

An LED lighting device for irradiating a cultivated surface includes a support made of thermally conductive material, optical bodies, a thin and flexible membrane, and an LED board superimposed on and in contact with the thin and flexible membrane and configured so that each LED faces the thin and flexible membrane and is aligned with a respective optical body. The configuration of the LED lighting device improves thermal transfer towards the cultivated surface.

According to at least one aspect, a lighting system is provided. The lighting system comprises a strip lighting device including a circuit board, a light emitting diode (LED) mounted to the circuit board, a lens disposed over the LED and configured to receive the light emitted from the LED and change at least one characteristic of the light received from the LED, and an elastomer encapsulating at least part of the circuit board. The lighting system further comprises a fixture configured to receive the strip lighting device and mount to a structure and a lighting accessory configured to removably couple to the fixture over the strip lighting device and change at least one characteristic of the light from the strip lighting device.

A lighting unit (10) is disclosed comprising a torsion box (50) having a plurality of sidewalls (60) and a grid of internal walls (70), each of said internal walls extending between a pair of said sidewalls, said internal walls defining a plurality of compartments (80) within the lighting unit. At least one solid state lighting element (30) is located within at least some of said compartments, and a back panel (20) is arranged at a first opening (51) of the torsion box delimited by the sidewalls such that the back panel covers said compartments, wherein a second opening (53) of the torsion box delimited by said sidewalls opposing the first major opening defines a light exit window of the lighting unit. Also disclosed is a lighting kit comprising such lighting units, and wherein at least some internal walls (70) have a recessed central portion (72) having a height (H′) of at most half the height (H) of said side walls (70).

A lighting unit (10) is disclosed comprising a torsion box (50) having a plurality of sidewalls (60) and a grid of internal walls (70), each of said internal walls extending between a pair of said sidewalls, said internal walls defining a plurality of compartments (80) within the lighting unit. At least one solid state lighting element (30) is located within at least some of said compartments, and a back panel (20) is arranged at a first opening (51) of the torsion box delimited by the sidewalls such that the back panel covers said compartments, wherein a second opening (53) of the torsion box delimited by said sidewalls opposing the first major opening defines a light exit window of the lighting unit. Also disclosed is a lighting kit comprising such lighting units, and wherein at least some internal walls (70) have a recessed central portion (72) having a height (H′) of at most half the height (H) of said side walls (70).

An optical article for illuminating building interiors including a reflective grid panel, an LED light source positioned above the reflective grid panel and configured to illuminate the reflective grid panel at incidence angles ranging from a minimum angle of 0° to a maximum angle of at least 45°, a light diffusing sheet of an optically transmissive dielectric material approximately coextensive with and oriented generally parallel to the reflective grid panel, and a pair of reflective side walls flanking a space between the reflective grid panel and the light diffusing sheet. The reflective grid panel incorporates a plurality of parallel longitudinal walls and a plurality of parallel transverse walls joining the walls and defining a plurality of rectangular openings configured to transmit light. Each of the parallel transverse walls extends transversely with respect to a plane of the reflective panel and is configured to diffusely reflect a portion of the light being transmitted through the plurality of rectangular openings.