A lighting device includes a light source to emit a modulated light, a memory device for storing an access code of a wireless network, and a controller to control generation of the modulated light based on the access code, wherein the access code is extractable from the modulated light by a light receiving device.

An example of a lighting system includes intelligent lighting devices, each of which includes a light source, a communication interface and a processor coupled to control the light source. In such a system, at least one of the lighting devices includes a user input sensor to detect user activity related to user inputs without requiring physical contact of the user; and at least one of the lighting devices includes an output component to provide information output to the user. One or more of the processors in the intelligent lighting devices are further configured to process user inputs detected by the user input sensor, control lighting and control output to a user via the output component so as to implement an interactive user interface for the system, for example, to facilitate user control of lighting operations of the system and/or to act as a user interface portal for other services.

Photographic lighting devices, systems, and methods having a plurality of electrical energy storage/discharge (EESD) elements and/or one or more light sources in a single photographic lighting device to perform one or more photographic lighting effects. EESD elements and one or more light sources can be configured to have multiple separate light emissions occur in a single image acquisition window. The multiple light emissions are separated in an image acquisition window by a time period that is about shutter speed exposure time/(N1), where N is the number of light emissions. In one such example, two light emissions are separated by a time period that is about shutter speed exposure time/(N1).

A laser sensor stimulator integrates laser units, an inertial measurement unit, a control unit, and ergonomic, modular design with GPS data feeds into a portable system that can be used to test energy sensors and warning devices and includes a user interface facilitates tracking and acquisition of items of interest by the laser sensor stimulator.

Method and device for adapting a series constant power system to operate constant voltage lighting.

An autonomous vehicle is disclosed. The vehicle comprises a chassis, two or more drive wheels extending below the chassis, a drive motor housed within the chassis for driving the drive wheels, and a payload surface on top of the chassis for carrying a payload. An illumination system, for emitting light from at least one portion of the chassis, is mounted substantially around the entire perimeter of the chassis. The illumination system may be implemented using an array of light-emitting diodes (LEDs) that are arranged as segments. For example, there may be headlight segments on the front left and front right corners of the chassis.

An optoelectronic circuit for receiving a variable voltage containing alternating increasing and decreasing phases. The optoelectronic circuit includes assemblies of light-emitting diodes mounted in series; a current source connected to each assembly by a switch; for each switch, a first comparison module for comparing the current passing through the switch with a current threshold; a second comparison module for comparing a voltage representing the voltage at the terminals of the current source with a voltage threshold; and a control module connected to the first and second comparison modules and designed to control the opening and closing of the switches, during each increasing phase and each decreasing phase, according to signals supplied by the first and second comparison modules.

Various improvements are provided to resonant DC/DC and AC/DC converter circuit. The improvements are of particular interest for LLC circuits. Some examples relate to self-oscillating circuit and others relate to converter circuits with frequency control, for example for power factor correction, driven by an oscillator.

A distributed driver for an optic signal generator has a first amplifier cell with one or more amplifiers configured to receive and amplify an input signal to create a first amplified signal. A second amplifier cell has one or more amplifiers configured to receive and amplify the input signal to create a second amplified signal. A first conductive path and second conductive path connects to the first amplifier cell and the second amplifier cell such that the inductance associated with the first and second conductive path counteracts a capacitance associated with the first amplifier cell and the second amplifier cell. A variable capacitor may be part of the first amplifier cell and/or the second amplifier cell to selectively tune the capacitance of the distributed driver. A distributed bias circuit may be part of the first amplifier cell and/or the second amplifier cell to bias an optic signal transmitter.

A lighting device with improved optical performance and efficiency is provided. The lighting device includes a source of energy, a light source, a reflector and a holder. The reflector has a first open end, a second end, and a parabolic profile extending between the first open end and second end. The focus of the parabolic profile is located outside of the profile. The reflector may also be movable relative to the light source. The lighting device may include a circuit that delivers a pulsed or thermally compensated pulsed current to the light source. The light device may also include a heat sink housing.