A technique for simplifying structure data for representing an environment. Polyhedrons can make up structure data used in an application such as modeling, visualization, and navigation. Consequently, the operations that are performed on the data often involve determining, for each polyhedron that defines a structure such as a building, whether the polyhedron obstructs a line-of-sight line between a first point in space being considered in the application and a second point. In order to determine whether a polyhedron obstructs a line-of-sight line, a data-processing system operating on the structure data must determine whether any walls of the polyhedron intersect the line. Thus, the more polyhedrons there are or the more vertices that are in each polyhedron, the more walls there are, and the more intersection checks are required, thereby adding to the computations. The disclosed technique reduces the number of walls by simplifying objects that make up the structure data.

A technique for simplifying structure data for representing an environment. Polyhedrons can make up structure data used in an application such as modeling, visualization, and navigation. Consequently, the operations that are performed on the data often involve determining, for each polyhedron that defines a structure such as a building, whether the polyhedron obstructs a line-of-sight line between a first point in space being considered in the application and a second point. In order to determine whether a polyhedron obstructs a line-of-sight line, a data-processing system operating on the structure data must determine whether any walls of the polyhedron intersect the line. Thus, the more polyhedrons there are or the more vertices that are in each polyhedron, the more walls there are, and the more intersection checks are required, thereby adding to the computations. The disclosed technique reduces the number of walls by simplifying objects that make up the structure data.

An electronic device comprising a lens and a selector ring is disclosed. The selector ring is mounted for rotation about the lens and comprises a plurality of tabs projecting inwards towards the lens which engaging with and are held within a tab receiving groove comprising a plurality of spaced notches. Each of the notches is dimensioned to receive one of said tabs. A wave spring positioned between an annular ledge of the lens and the selector ring which biases the plurality of tabs against the groove and such that when each of the plurality of tabs is positioned adjacent a respective one of the notches, the tabs are biased into the notches thereby preventing said selector ring from being rotated. A user disengages the tabs from the notches by pressing said selector ring against the bias of the wave spring, thereby allowing the selector ring to be rotated.

A lighting system can include a light fixture located in a hazardous environment, wherein the light fixture comprises a controller. The light fixture can also include a sensor module communicably coupled to the controller of the light fixture, wherein the sensor module comprises a sensor module housing and a sensor disposed within the sensor module housing, wherein the sensor module housing comprises a first coupling feature that couples to a hazardous location enclosure. The hazardous location enclosure and the sensor module, when coupled to each other, can comply with applicable standards for the hazardous environment.

Implementations generally relate to facilitating use of high volume, highly standardized low cost components, with a minimum of specialty components, in the manufacture of light emitting diode (LED) light fixtures. In some embodiments, an apparatus for providing LED lighting includes a physical form having a predetermined shape, where the form is configured to support at least one LED strip thereto, and where the predetermined shape causes the at least one LED strip to be so configured as to emit light in a predetermined emission pattern when the at least one LED strip is coupled to the physical form. The apparatus further includes at least one constraint mechanism, where the at least one constraint mechanism, in whole or in part, constrains the at least one LED strip to remain configured to its predetermined shape.

Systems and apparatus for joining structures, such as light fixture sections, are provided. In some example embodiments, a joiner assembly can include a hook element having an opening defined in at least one side portion of the hook element and a translational element passing through the opening of the hook element. The joiner assembly further includes an actuator operably connected to the translational element such that rotational movement of the actuator causes the translational element rotate the hook element from a first position to a second position.

An elongate light includes a main body, being an extruded flexible plastic member, including a frame portion, a base board and two wing portions which are integrally formed of one piece. A longitudinal direction of the main body is defined as a first direction. The base board and the frame portion are connected to form a tubular structure. The two wing portions extend outwardly from two sides of the base board toward a direction away from the frame portion. A side of the base board away from the frame portion has at least one lighting element.

An elongate light includes a main body, being an extruded flexible plastic member, including a frame portion, a base board and two wing portions which are integrally formed of one piece. A longitudinal direction of the main body is defined as a first direction. The base board and the frame portion are connected to form a tubular structure. The two wing portions extend outwardly from two sides of the base board toward a direction away from the frame portion. A side of the base board away from the frame portion has at least one lighting element.

A light emitting diode (LED) tube lamp configured to receive an external driving signal includes an LED module for emitting light, the LED module comprising an LED unit comprising an LED; a rectifying circuit for rectifying the external driving signal to produce a rectified signal, the rectifying circuit having a first output terminal and a second output terminal for outputting the rectified signal; a filtering circuit connected to the LED module, and configured to provide a filtered signal for the LED unit; and a protection circuit for providing protection for the LED tube lamp. The protection circuit includes a voltage divider comprising two elements connected in series between the first and second output terminals of the rectifying circuit, for producing a signal at a connection node between the two elements; and a control circuit coupled to the connection node between the two elements, for receiving, and detecting a state of, the signal at the connection node. The control circuit includes or is coupled to a switching circuit coupled to the rectifying circuit, and the switching circuit is configured to be triggered on or off by the detected state, upon the external driving signal being input to the LED tube lamp, to allow discontinuous current to flow through the LED unit.

A lighting assembly, comprising a housing (2) and a lighting element (6). The housing (2) is manufactured by extrusion from at least one flexible material, and comprises a first housing wall (21), a second housing wall (22) and a third housing wall (23). The first housing wall (21) is pivotably connected to the second housing wall (22) by means of a first flexible hinge (31), and the second housing wall (22) is pivotably connected to the third housing wall (23) by means of a second flexible hinge (32). The lighting element (6) is located inside the housing (2), and arranged to emit light out from the housing (2). The housing (2) comprises locking means for releasably locking a free edge of the first housing wall (21) to a free edge of the third housing wall (23) to arrange the housing (2) in an operating position, the locking means comprising a first locking member (81) formed in the first housing wall (21), and a second locking member (82) formed in the third housing wall (23) and arranged to cooperate with the first locking member (81). The housing (2) is manufactured in one extrusion process, the material of the third housing wall (23) is translucent, and the lighting element (6) is arranged to emit light out from the housing (2) through the third housing wall (23).