The lighting control device includes a controller. The controller generates a second dimming signal corresponding to a measurement result of brightness of surroundings in the first mode and generates a second dimming signal corresponding to a first dimming signal in the second mode. The controller selects the first mode and start operating in the first mode when receiving the first dimming signal having a third duty cycle not falling within a range from a first duty cycle corresponding to an upper limit of the dimming level to a second duty cycle corresponding to a lower limit of the dimming level. The controller selects the second mode and start operating in the second mode when receiving the first dimming signal having a duty cycle falling within the range.

The excimer lamp includes: a discharge container having a substantially quadrangular shape with a cross section, the discharge container having a pair of flat walls extending in a longitudinal direction and a pair of side walls connecting the flat walls; a pair of external electrodes facing each other disposed on outer surfaces of the pair of flat walls, respectively; a first internal electrode disposed inside the discharge container so as to extend toward inner surfaces of the pair of flat walls; and a second internal electrode disposed inside the discharge container at a position spaced apart from the first internal electrode in the longitudinal direction so as to extend toward the inner surfaces of the pair of flat walls. The first internal electrode and the second internal electrode are respectively disposed at positions between end parts and central parts of the external electrodes in the longitudinal direction.

Lighting units, systems, and methods are described herein for determining whether occupancy detections are legitimate or not. Methods and systems are further described herein for powering down a network of power over ethernet (PoE) components.

Methods, apparatuses and systems are described herein for harmonizing firmware among lighting units of a lighting system. In some embodiments, a lighting unit controller of a lighting unit may be configured to: broadcast, to a plurality of remote lighting units of the lighting system, data indicative of a version of the firmware used locally; receive, directly or indirectly from at least one remote lighting unit of the lighting system, data indicative of a version of firmware used by the at least one remote lighting unit; determine that the version of firmware used by the at least one remote lighting unit is different from a version of the firmware stored in the memory; and take remedial action to harmonize the firmware stored in the memory with the firmware used by the remote lighting unit.

Lighting units, lighting systems, and methods are described herein for automatic and decentralized commissioning of a replacement lighting unit (140, 150, 250). In various embodiments, a replacement lighting unit may receive, from one or more remote lighting units over one or more communication networks, one or more identifiers associated with the one or more remote lighting units. The replacement lighting unit may also receive, from at least one of the one or more remote lighting units over the one or more communication networks, the lighting operation parameters associated with an inoperative lighting unit. The replacement lighting unit may then selectively energize one or more light sources (258) associated with the replacement lighting unit to emit light having one or more properties indicated in the lighting operation parameters associated with the inoperative lighting unit.

Lighting units, systems, and methods are described herein for determining whether occupancy detections are legitimate or not. Methods and systems are further described herein for powering down a network of power over ethernet (PoE) components.

Embodiments are included for providing an energy efficient lighting system that includes one or several luminaires. According to certain aspects, when an area covered by the luminaires is vacant, the light level in the area is measured while the luminaires are on and set to a low dim level. The measured light level is used to approximate the amount of natural light in the area and when the measured light level exceeds a predetermined nonzero light level, the luminaires are turned off for a certain time period. Once the time period expires, the light level is measured again to approximate the amount of natural light present in the area.

Lighting units, systems, and methods are described herein for determining whether occupancy detections are legitimate or not. Methods and systems are further described herein for powering down a network of power over ethernet (PoE) components.

A method (3600) and system (2800, 2900, 3000, 3100) autonomously create a restore point for a luminaire controller (2810, 3110) and restore it to proper operation when required. The luminaire controller operates by using first operating software having a first software image, and receives a second software image of second operating software. The luminaire controller communicates the first software image to a first device (2820, 3120) connected to the luminaire controller via a communication network (2805, 3105), installs the second operating software, and performs a self test of the luminaire controller. If the luminaire controller fails the self test, the luminaire controller requests via the network that the first device transfer the first software image to the luminaire controller via the network, receives the first software image, installs the first operating software, and reverts to operation with the first operating software.

An optical projection apparatus includes a light specification setting unit for setting a specification of a light, a shape setting unit for setting a shape made by the light, a position setting unit for setting a position of the shape, a size setting unit for setting a size of the shape, an optical data generation unit for generating optical data based on the specification, the shape, the position, and the size. The optical projection apparatus further includes a light drawing unit for generating light drawing data by performing a drawing process with the optical data, an optical projection unit for projecting the shape at the position with the light drawing data, and a manipulation unit for allowing a user to set one or more parameters indicating the specification, the shape, the position, and the size.