An emergency lighting device includes a housing, a light emitter positioned in the housing, a control circuit positioned in the housing and operatively connected to the light emitter, an indicator light positioned in the housing, and a fault indicator circuit positioned in the housing and operatively connected to the indicator light. The fault indicator circuit is configured to monitor the light emitter, analyze activation of the light emitter, and activate the indicator light based on the analysis of the activation of the light emitter.

The invention provides a lighting device comprising a transmitter, a controller and a sensor; wherein the controller is configured to control the transmitter to repeatedly transmit a second wireless message interleaved with a first wireless message, wherein the first wireless message has a first duration and comprises a first signal, wherein the second wireless message has a second duration and comprises a second signal; wherein the first duration and/or the second duration is adaptive during a lifetime of the lighting device; wherein the controller is configured to receive a measurement from the sensor and control the transmitter to transmit the second wireless message comprising the second signal comprising the measurement.

System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current generator configured to generate a first current flowing through one or more light emitting diodes. The one or more light emitting diodes are configured to receive a rectified voltage generated by a rectifying bridge coupled to a TRIAC dimmer. Additionally, the system includes a bleeder configured to receive the rectified voltage, and a controller configured to receive a sensing voltage from the current generator and output a control signal to the bleeder. The sensing voltage indicates a magnitude of the first current.

To detect a malfunction of a light-emission driving unit (110) that drives a light emitting element (20) in a light-emission driving device (10). A malfunction detection device (100) is provided to the light-emission driving device (10) including the light-emission driving unit (110) that supplies a light-emission current for causing the light emitting element (20) to emit light during a light-emission period during which the light emitting element (20) is caused to emit light. The malfunction detection device (100) provided to this light-emission driving device (10) detects, on the basis of a voltage of an output terminal (113), a malfunction of the light-emission driving unit (110), the output terminal (113) being a terminal in the light-emission driving unit (110) that supplies the light-emission current for causing the light emitting element (20) to emit light during the light-emission period, the terminal supplying the light-emission current.

To detect a malfunction of a light-emission driving unit (110) that drives a light emitting element (20) in a light-emission driving device (10). A malfunction detection device (100) is provided to the light-emission driving device (10) including the light-emission driving unit (110) that supplies a light-emission current for causing the light emitting element (20) to emit light during a light-emission period during which the light emitting element (20) is caused to emit light. The malfunction detection device (100) provided to this light-emission driving device (10) detects, on the basis of a voltage of an output terminal (113), a malfunction of the light-emission driving unit (110), the output terminal (113) being a terminal in the light-emission driving unit (110) that supplies the light-emission current for causing the light emitting element (20) to emit light during the light-emission period, the terminal supplying the light-emission current.

In an automatic parking system, a marker recognizing unit performs recognition of a predetermined number of markers located respectively at predetermined locations in a parking garage. A marker deter miner performs determination of whether there is a problem in recognition of at least one marker in the predetermined number of markers in accordance with information resulting from the recognition performed by the marker detector. An output unit outputs marker state information resulting from the determination performed by the marker determiner.

An emergency lighting system that includes a storage device, an emergency lighting device, an area control device and an external device. The emergency lighting device includes a light, a first controller having a first electronic processor configured to perform a self-diagnostic test, and a first input/output (I/O) device configured to transmit data associated with the self-diagnostic test. The area control device includes a second I/O device configured to receive data associated with the first self-diagnostic test form the first I/O device and transmit the data associated with the self-diagnostic test to the storage device.

A towing vehicle includes a towing control unit with circuitry to detect whether a light is connected to the electrical harness electrically coupling the vehicle to the trailer. The towing control unit may include lamp connectivity circuits for, for example, the left turn signal and the right turn signal. To determine whether the turn light is connected, the corresponding connectivity circuit periodically generates a test signal. Based on characteristics of a response signal to the test signal. The connectivity circuit determines whether the corresponding turn signal light of the trailer is connected based on a response to the test signal. The connectivity circuit may distinguished whether an incandescent-based turn signal light, a light emitting diode (LED)-based turn signal light, and an open circuit is sensed based on the characteristics of the response signal.

The present disclosure provides an LED straight light including a light tube with two pins at both ends, an LED installed in the light tube and a driving circuit. The driving circuit includes a mains branch and a signal branch. The mains branch is coupled to the pins at one end of the light tube for transmitting power to the LED for power supply. The signal branch is coupled to the pins at the other end of the light tube for transmitting external driving signals to control the on/off of the mains branch. The LED straight light of the present disclosure is powered by two ends, one of the two ends supplies power to the LED through the mains branch, and the other end receives driving signals to control the on/off of the mains branch.

An elongated lighting module having an asymmetric illumination source formed from at least two rows of light emitting diodes (LEDs) that extend along the long axis of the module and are independently controllable. The lighting modules are powered via a wiring harness that extends down a support pole to a power converter stack having LED drivers to control the modules. The power supply for lighting module includes a power enclosure having individual light emitting drivers for powering the rows of light emitting diodes that can adjust the power level to compensate for the loss of power from another of the light emitting drivers. The power supply may also include a backup that can be switched over to power the rows of light emitting diodes in the event of a failure.