Abstract: LED lamp systems having improved light quality are disclosed. The lamps emit more than 500 lm and more than 2% of the power in the spectral power distribution is emitted within a wavelength range from about 390 nm to about 430 nm.

Abstract: A system can configure a luminaire for providing illumination of a selected color temperature, a selected lumen output, or a selected photometric distribution. The luminaire can comprise at least two light sources that have different illumination characteristics, for example different color temperatures, different lumen outputs, or different photometric distributions. The system can configure the luminaire to operate a first of the two light sources, a second of the two light sources, or both of the light sources based on an input. When the luminaire is configured to operate both of the light sources, the luminaire can produce illumination having a color temperature, a lumen output, or a photometric distribution that is different than either of the two light sources.

Abstract: The present invention provides a power control circuit which has a timing unit used for timing an elapsed time of current half cycle of the phase-cut AC power supply signal, outputting a current accumulated timing duration, and outputting a first control signal at a starting moment when a starting point of a half cycle of the AC power supply signal is detected; a regulating unit connected to the timing unit and comprising a temporary storage module, wherein a final reference time interval is stored in the temporary storage module, and when the current accumulated timing duration reaches the final reference time interval, the regulating unit outputs a second control signal; and a control unit connected to the detection unit and the regulating unit and used for controlling current in a load based on the first control signal and the second control signal.

Abstract: A device and method for operating a lighting system varies a characteristic of visible light emitted by a first lighthead according to a predefined profile, and fixes a characteristic of visible light emitted by a second lighthead. A light sensor configured to view a focal area of the second lighthead detects a characteristic of visible light on a target surface over a period of time, and the characteristic of the light detected by the light sensor over the period of time is compared to the characteristic of light defined in the predetermined profile. A mode of operation of the first and second lighthead is determined based on the comparison.

Abstract: A load control device for controlling the intensity of a lighting load, such as a light-emitting diode (LED) light source, may include a power converter circuit operable to receive a rectified AC voltage and to generate a DC bus voltage, a load regulation circuit operable to receive the bus voltage and to control the magnitude of a load current conducted through the lighting load, and a control circuit operatively coupled to the load regulation circuit for pulse width modulating or pulse frequency modulating the load current to control the intensity of the lighting load to a target intensity. The control circuit may control the intensity of the lighting load by pulse width modulating the load current when the target intensity is above a predetermined threshold and control the intensity of the lighting load by pulse frequency modulating the load current when the target intensity is below the predetermined threshold.

Abstract: One example described herein includes a light-emitting diode (LED) driver system. The system includes an error amplifier configured to compare an input voltage with a reference voltage to generate a control voltage. The system further includes an amplifier output stage configured to control an output current through a first current path and a shunt current through a second current path based on the control voltage. The amplifier output stage comprises a slew-rate controller configured to control a slew-rate of the shunt current. The shunt current can be provided through a shunt resistor in the second current path and added to the output current to provide a total current through an LED string.

Abstract: Systems and methods which leverage the wireless communication capability present in wireless-enabled luminaires where the lamps include a short-range wireless transceiver and can be controlled by a smart appliance. The wireless capability of a luminaire may be paired with a compatible wireless interface system (e.g., adapter system) that allows for control of the luminaire via plug-in or hard-wired photocontrols and wireless network lamp control nodes. An adapter system may be provided that replaces a standard wired receptacle of a luminaire. The adapter system may include a wired interface to the luminaire which provides power to the wireless adapter system. The wireless adapter system may include a receptacle interface that receives a plug of a control node, such as photocontrol or a networked control node. The wireless adapter system may also include a wireless interface circuit that communicates control, status or other data between the connected control device and the luminaire.

Abstract: A ripple reduction circuit for reducing a current ripple of a driver is provided. The driver circuit comprises an input section with input contacts for connecting the driver circuit to an AC power supply providing an AC input current and a power section for providing an output power, the power section comprising a power transformer and a power switch connected in series with a primary winding of the power transformer. The driver circuit further comprises a ripple reduction circuit with an inductance and a capacitive and two diodes, the ripple reduction circuit being configured such that, in operation, the inductance and the capacitance can be alternately charged and discharged, depending on the switching state of the power switch.

Abstract: A vehicle lighting system includes a rotatable, depressible, rotary dimmer switch with a light emitting diode ring indicator and a vehicle lighting controller. The vehicle lighting controller controls the operation of at least a first lighting circuit and a second lighting circuit. A digital input from the rotary dimmer switch places the controller in a first configuration mode or a second configuration mode. The digital input from the rotary dimmer also switches between apply configuring the first lighting circuit or the second lighting circuit. The LED illuminates in a first color for the first circuit and a second color for the second circuit. The rotary dimmer adjusts the operating parameter and/or the overcurrent protection associated with the first lighting circuit and the second lighting circuit.

Abstract: A voltage-regulating drive circuit for an LED luminaire is disclosed. The drive circuit includes one or several series of LED light engines. A voltage source with a regulator is connected to the series of LED light engines to forward-bias the light engines. The circuit also includes a driver integrated circuit, which may drive the series of LED light engines using, e.g., pulse-width modulation (PWM). The circuit also includes a feedback circuit connected to the cathode end of the series of LED light engines. The feedback circuit receives a remainder voltage and creates a feedback output signal that upregulates or downregulates the regulator of the voltage source to keep a minimum operating voltage on the driver integrated circuit and to compensate for variations in forward voltages among LED light engines in the series.

Abstract: A lighting apparatus includes a rectifier, a loading module, a constant current switch module and a current supplemental module. The rectifier is connected to an output of the AC power for receiving an AC signal to convert the AC signal to a positive wave signal. The loading module includes multiple loading units. The loading module is disposed on the output of the rectifier. The constant current switch module is connected to output of each loading unit and to control the working cycle of each loading unit so as to ensure a total passing current of the loading module is opposite in phase to the positive wave signal to keep output power constant. The current supplemental module supplies output current to the loading module when the positive wave signal is in sufficient to drive the loading module.

Abstract: A device may include a light-emitting diode (LED) array including a plurality of LEDs, a rectifier configured to supply an input voltage rectified from an AC voltage to the LED array, an LED driver configured to drain an LED driving current from the LED array, and a current distributor configured to sense a first current passing through at least one first LED from among the plurality of LEDs and supply a second current to at least one second LED from among the plurality of LEDs based on the first current.

Abstract: A light emitting diode (LED) driving device for driving an LED array including one or more LEDs includes a rectifier configured to provide a rectified voltage obtained from an alternating current (AC) voltage to the LED array, an LED driver configured to sequentially drain an LED driving current from the LED array via a plurality of first nodes, and a first switch circuit connected to the LED array via a plurality of second nodes. The first switch circuit includes a plurality of first switches commonly connected to a first common node which is one of the plurality of first nodes, and respectively connected to the plurality of second nodes, and a first controller configured to control the plurality of first switches to be sequentially turned on and sequentially turned off.

Abstract: Apparatus and associated methods relate to a lighting display that has a plurality of independently-controllable lighting elements distributed therealong. The plurality of independently-controllable lighting elements are series-connected from a first, through intervening one(s), to a last of the plurality of independently-controllable lighting elements. The intervening one(s) of the plurality of independently-controllable lighting elements receiving input power from and providing an output control signal to an immediately preceding one of the plurality of independently-controllable lighting elements. The intervening one(s) of the plurality of independently-controllable lighting elements providing output power to and receiving an input control signal from an immediately succeeding ones of the plurality of independently-controllable lighting elements.

Abstract: A multi-channel constant current circuit and a lighting device are provided. The multi-channel constant current circuit is used to drive UVC LED to emit light, and includes a constant voltage circuit and a first number of linear constant current diodes. The constant voltage circuit includes a power input terminal, a power output terminal and a voltage regulation sub-circuit. The power input terminal is connected to the power output terminal through the voltage regulation sub-circuit, each of the linear constant current diodes is connected to the power output terminal, the linear constant current diode is used to connect a second number of UVC LEDs and keeps a working current of each UVC LED, and the voltage regulation sub-circuit is used for a constant output voltage.

Abstract: A streetlight asset module (SAM) is provided including at least one memory block configured to store operating configuration settings of a streetlight associated with the SAM. The SAM is configured to communicate the operating configuration settings of the streetlight to a control and monitoring system (CMS) node coupled to the streetlight. The CMS node is configured to communicate the operating configuration settings to a remote location using a radio communications network. Related streetlights and systems are also provided.

Abstract: The method for determining a quality factor of an accelerating superconducting cavity of a particle accelerator, in particular a linear particle accelerator, the method includes determining a heat load to which a cryomodule having the accelerating cavity and a bath of cryogenic fluid is subjected, then determining a quality factor based on the determination of the heat load during the operation of the particle accelerator.

Abstract: A laser projection device that includes at least one laser diode for generating at least one laser beam, and at least one movable mirror element for deflecting the at least one laser beam. The laser projection device includes at least one control and/or regulation unit that is designed to control and/or regulate a brightness of the at least one laser beam as a function of a relative deflection speed of the at least one laser beam.

Abstract: The system of the present application is a switching system for LEDs which prevents breakdown of the system LED driver when switching between LEDs. The system switches between a first LED sting and a second LED string utilizing an LED driver, at least one LED module, a driver input, at least one pair of switching inputs and a switching module such that the first and second LED strings are activated by the switching module at all times, and each of the first and second LED strings operate with a driver output voltage within a voltage-current operating range of the LED driver. This allows the use of different sets of LEDs without requiring duplication of other system components.

Abstract: Method of controlling warning lights to enter low power mode includes steps of: setting predetermined ID Number of warning lights as starter, and remaining ID numbers as receivers; warning light set as starter receiving start command from control bus through signal line, and sending data, clock pulse, and ID information from data bus, and choosing low power mode to flash; warning lights set as receivers obtaining data, clock pulse, and ID information from data bus through signal lines, and flash mode of receivers and starter flashing in low power mode, and active switch of control circuit that executes low power mode receiving low power command sent from starter and forming conductive state, and current-reducing resistor which is electrically connected to active switch reducing passing current to predetermined ratio, so that reduced current is transmitted to receivers and then starter executes low power mode and reduces brightness of warning lights.