A matrix light source intended to be supplied with a voltage and having a plurality of electroluminescent semiconductor element-based elementary light sources and a common substrate in contact with an integrated circuit. The integrated circuit includes, for each elementary light source, a switching device for selectively connecting it to a voltage source on the basis of a first control signal. The substrate includes, for at least one of the elementary light sources, an open-circuit fault detection circuit for detecting an open-circuit fault with the elementary light source.

A high-bay light-emitting diode (LED) light fixture including, a driver chamber assembly, a hook assembly, and an LED assembly. The driver chamber assembly further includes a driver chamber body that houses a driver module and/or a controller module, and a driver chamber cap. The hook assembly further includes a hook and a hook clip. The LED assembly further includes a light board, an LED module that supports an arrangement of LEDs, and a lens.

A method for identifying a short in a first light emitting diode element may include providing a first actuating circuit being a switched-off condition, wherein an output thereof is coupled to a first electrode of the first light emitting diode element, providing a second actuating circuit being a switched-off condition, wherein an output thereof is coupled to a first electrode of a second light emitting diode element and wherein inputs of the first and second actuating circuits, second electrodes of the first and second light emitting diode elements are electrically coupled to a first node, coupling the first electrode of the first light emitting diode element to a first connection of a test energy source, operating the first light emitting diode element in the off-state region using the test energy source, performing a check whether an electric current flows via the first light emitting diode element, and identifying the short.

The invention discloses an electric power supply device for a plurality of light sources on a motor vehicle. The device comprises a plurality of means for the control of the electric power supply of at least one of said light sources respectively. The control means each comprise diagnostic means which are configured to deliver a diagnostic signal for said light source. According to the invention, the device is designed to deliver two binary signals for the identification of a partial failure and/or a total failure of light sources.

A light emitting element driving device includes a first and second driving circuits, an abnormality detecting portion, a bypass path, and a switching portion. The first driving circuit can supply power to a light emitting element in a first mode, and is disabled to supply power in a mode other than the first mode. The second driving circuit can supply power to a light emitting element in a second mode. The abnormality detecting portion detects an abnormality of the light emitting element normally connected to the second driving circuit at least in the second mode. The bypass path connects the first driving circuit to the second driving circuit. The switching portion, is disposed in the bypass path so as to make the bypass path into a conductive state when an abnormality is detected, and to make the bypass path into a cutoff state when an abnormality is not detected.

Various embodiments of methods and systems of proactive monitoring and metering of lighting devices are described herein. A light monitoring and metering system may include a specification database that stores the technical specification of the lighting device, a usage database that records the usage data of the lighting device, a data acquisition subsystem that obtains the identity of the lighting device in use, and a data processing subsystem that meters the usage or calculates the lumen output of the lighting device or the remaining lifetime of the driver of the light device.

A light emitting diode system allows for high current end user LED matrix applications while mitigating internal damage to control circuitry that may be caused by excess current flow. In one example, multiple switches operate in parallel across an LED. When an overvoltage condition is detected in a first switch, a logic circuit determines those switches programmed to operate in parallel and causes them to conduct current. This reduces the amount of current flowing through any one switch and mitigates harm to the device. The parallel configuration of switches may be driven by a single pulse width modulated current. This allows the drive current to be divided between parallel transistors, limiting the damaging effects that can be caused by high currents flowing through the transistors.

A method is provided for removing a light-emitting diode (LED) module from a luminaire that has a controller and a housing. The housing encloses an optical system that includes the LED module and other optical devices. The method includes electrically uncoupling an LED circuit board of the LED module from the controller. The method further includes mechanically uncoupling the LED module from the luminaire without removing other optical devices of the optical system from the housing.

The present invention discloses active blue light leakage preventing LED structures. Each of the structure includes a circuit board, at least one blue light LED die, a photo detector and a wavelength transformation layer, wherein the electric circuit on the circuit board receives detection signal from the photo detector and turns off the said blue light LED die accordingly. With the implementation of the present invention, the active blue light leakage preventing LED structure turns off the blue light LED die when it reaches its usage life span limit thus avoiding damage to human from the massive release of blue light.

A system for sensing luminaire properties and controlling luminaire performance independently of the location, distance or orientation of the sensors relative to the source luminaire device that is being sensed. Thus, the installer and the maintenance crew are freed from issues and activities associated with sensor installation.