Abstract: A method for detecting a failure of at least one light emitting diode in a light emitting diode arrangement to which a supply current is applied by a constant-current source via a supply terminal and in which a respective luminous state of the light emitting diodes is set individually or in groups by means of a respective switching element by respective short-circuiting is disclosed, wherein a voltage signal of a chain voltage dropped across the light emitting diodes and dependent on the respective switching state of the switching elements is tapped off by a circuit apparatus at the supply terminal. The voltage signal is fed to an analog maximum value detector of the circuit apparatus, the maximum value detector is operated for a predetermined measurement duration and a maximum value signal of the voltage signal is provided at an output of the maximum value detector after the measurement duration.

Abstract: A luminaire can include a housing having at least one outer surface that forms a cavity. The luminaire can also include an aperture that traverses the at least one outer surface of the housing. The luminaire can further include a substrate disposed within the cavity. The luminaire can also include an electrical connector disposed on the substrate adjacent to the aperture. The luminaire can further include a switch coupled to the electrical connector, where switch has multiple positions, where each position of the switch corresponds to a discrete correlated color temperature (CCT) output by multiple light sources of the luminaire.

Abstract: Aspects are provided for controlling outdoor lighting systems using a photocontrol interface that can be connected to a motion sensor and a luminaire driver or ballast. In some aspects, a dimming control node is electrically and communicatively coupled to a motion sensor via wired connections to a photocontrol interface. The dimming control node is also communicatively coupled to a luminaire ballast or driver. The dimming control node receives sensor data from the motion sensor via one of the wired connections and provides power to the motion sensor via another one of the wired connections. The dimming control node can determine a sensor output state of the motion sensor from the received sensor data, and can select a dim-level configuration corresponding to the determined sensor output state. The dimming control node can configure the luminaire ballast or driver in accordance with the selected dim-level configuration.

Abstract: A light emitting diode (LED) display apparatus, including: a plurality of LED lines including a plurality of LEDs; a plurality of switches connected to respective LED lines among the plurality of LED lines; a controller configured to sequentially supply power to the plurality of LED lines by sequentially turning on and off the plurality of switches; and an LED driver configured to detect an error state of an LED from the plurality of LEDs by estimating current flowing through the plurality of LED lines, and to provide the controller with a result of the detection.

Abstract: Disclosed is an LED lighting apparatus capable of performing lighting using a rectified voltage. The LED lighting apparatus may include a lamp divided into a plurality of light emitting modules, and perform lighting using a voltage obtained by lowering a rectified voltage, thereby preventing internal parts from being damaged by a surge voltage. Furthermore, the structure in which LED groups are arranged on a substrate can be improved to uniformize the light intensity.

Abstract: An LED lighting device 2 according to this embodiment includes a lighting circuit that supplies a current to an LED, and a dimmer 7 that generates a PWM signal for controlling the supply of the current to the LED from the lighting circuit, in which the dimmer 7 feedback-controls the PWM signal that controls the supply of the current to the LED by comparing the output current to be output to the LED with a target current and feedforward-controls the PWM signal according to a fluctuation of an input voltage from a commercial power supply 1.

Abstract: The invention relates to an illumination system (A) having at least one operating device (1) for operating lighting means, having a control device (10) which is connected by means of an analogue or digital light control bus to the operating device and is designed for transmission of analogue or digital control commands via the light control bus, wherein the control device (1) is designed to control the operating devices (1) in terms of brightness and/or color by means of control commands, wherein furthermore the control device is connected to a IPv6 bus system, the control device (10) is designed to receive IPv6 bus commands via the IPv6 bus system and is designed to transmit a colour command or a brightness command as control command, according to the received IPv6 bus commands, to at least one operating device, and the operating device is designed to adapt the control of the lighting means according to the received colour command or brightness command.

Abstract: Provided is a controller for use with a luminaire. The controller that includes a processor connected to at least one lead of a receptacle included in the luminaire. The processor can be programmed to multiplex at least one lead of the receptacle to achieve at least one of a plurality functions.

Abstract: A lighting device may be implemented to automatically adjust a projected light level based on ambient lighting conditions detected at a sensor. In one example, a lighting device includes a light source adapted to project light. The lighting device also includes a sensor adapted to provide illumination measurements based on ambient light detected by the sensor including at least a reflected portion of the projected light. The lighting device also includes a controller adapted to select a range of illumination levels and adjust the projected light based on the provided illumination measurements to transition the projected light through a plurality of projected light levels until at least a new illumination measurement provided by the sensor is within the range of illumination levels. Additional devices and related methods are also provided.

Abstract: An apparatus for controlling a vehicle lamp includes a turn signal lamp, a turn signal lamp switch configured to operate the turn signal lamp, a lane change detector configured to detect lane change, and a controller configured to release the operation of the turn signal lamp when the lane change detector determines that the lane change has been completed after the operation of the turn signal lamp switch.

Abstract: A lighting system includes various LED boards. The LED boards are connected to a power source via an LED driver that regulates power from the power source to the LED boards. The LED driver includes a positive output and a negative output. The positive output of the LED driver is connected to a positive connection point of a first LED board and the negative output of the LED driver is connected to a negative connection point of a last LED board to distribute power or current approximately evenly across the LED boards. Distributing power or current approximately evenly across the LED boards or balancing current through the LED boards can cause the brightness or intensity of various LEDs in the lighting system to be approximately the same.

Abstract: The present disclosure provides systems for generating tunable white light. The systems include a plurality of LED strings that generate light with color points that fall within blue, yellow/green, red, and cyan color ranges, with each LED string being driven with a separately controllable drive current in order to tune the generated light output.

Abstract: A light emitting device array comprises a plurality of light emitting diode (LED) strings connected in parallel to each other, each of which includes a plurality of light emitting devices connected in series. A sum of forward voltages (Vf) of a plurality of light emitting devices included in at least one LED string among the plurality of LED strings is less than that of forward voltages of a plurality of light emitting devices included in a different LED string. The at least one LED string includes a voltage compensation unit, to compensate for a difference in forward voltage levels between the at least one LED string and the different LED string.

Abstract: A light emitting device includes a series connection unit constituted of N light emitting elements, a light emitting element driving circuit having an output terminal connected to an anode of the series connection unit, N short-circuit switches respectively connected in parallel to the light emitting elements, and a switch control unit arranged to control on and off of the short-circuit switches. A ground fault detection circuit, which detects a ground fault of the light emitting device, includes a reference voltage source arranged to generate a reference voltage, and a comparator arranged to compare the anode voltage of the series connection unit with the reference voltage. The reference voltage has a value smaller than the product of an on-resistance of one of the short-circuit switches and output current of the light emitting element driving circuit.

Abstract: In one example, a sensor node comprises a core node to enable lighting control for a luminaire. The core node has a base forming a plug portion of a socket. The plug portion has at least one optional pin and represents a NEMA socket including a receptacle that is attached to the base of the core node such that the core node is enclosed by the NEMA socket. The socket provides light level control for a light-emitting diode (LED) driver for the luminaire. The sensor node further comprises one or more peripheral devices having sensors for detecting conditions and producing sensor information based on the detected conditions. The sensor node also includes a pod bus which enables power signals to be transmitted to each of the peripheral devices.

Abstract: Driver circuitry is coupled between a power supply and at least one LED in a solid-state lighting fixture, such that a non-isolated direct current (DC) path exists between the power supply and the at least one LED. The driver circuitry is configured to receive an AC input voltage and generate a driver output current for driving the at least one LED from the AC input voltage. By using driver circuitry that is non-isolated from the at least one LED in the solid-state lighting fixture, the efficiency of the driver circuitry may be increased, while simultaneously reducing the cost and complexity of the driver circuitry compared to conventional driver circuitry.

Abstract: A ballast stabilizer-compatible lamp including a leakage current protection circuit includes a first input stage configured to receive first external power, a second input stage configured to receive second external power, a first switch module electrically connected to the first input stage and configured to switch on/off depending on a predetermined condition, a second switch module electrically connected to the second input stage and configured to switch on/off depending on a predetermined condition, an overvoltage protection circuit electrically connected to the first switch module and the second switch module and configured to prevent an overvoltage, a control module electrically connected to the overvoltage protection circuit and configured to sense and control the state of the first switch module, the first switch module, and the overvoltage protection circuit, and a light source electrically connected to the control module and configured to radiate light when power is applied.

Abstract: A switching power supply device has: a switching output stage configured to generate from an input voltage an output voltage to feed it to a load; a controller IC configured to control the switching output stage such that a feedback voltage applied to an output feedback terminal of the controller IC remains equal to a predetermined reference voltage; a first resistor connected between the output terminal of the output voltage and the output feedback terminal; a second resistor connected between the output feedback terminal and a ground terminal; a sense resistor configured to convert the output current passing between the load and the ground terminal into a sense voltage; and a first diode whose anode is connected to the application terminal of the sense voltage and whose cathode is connected to the output feedback terminal.

Abstract: An emergency lighting module for providing emergency power to a solid state luminaire. The emergency lighting module includes a first input configured to receive a DC input voltage from the solid state luminaire, a second input configured to receive a status signal indicative of the status of an AC line voltage, and a first output configured to supply a DC output voltage to the solid state luminaire. The emergency lighting module is configured to supply the DC output voltage to the solid state luminaire in response to a reduction of the AC line voltage.

Abstract: High-performance light-emitting diode together with apparatus and method embodiments thereto are disclosed. The light emitting diode devices emit at a wavelength of 390 nm to 470 nm or at a wavelength of 405 nm to 430 nm. Light emitting diode devices are characterized by having a geometric relationship (e.g., aspect ratio) between a lateral dimension of the device and a vertical dimension of the device such that the geometric aspect ratio forms a volumetric light emitting diode that delivers a substantially flat current density across the device (e.g., as measured across a lateral dimension of the active region). The light emitting diode devices are characterized by having a current density in the active region of greater than about 175 Amps/cm2.