A solid-state light emitter power supply includes a first rectifier circuit, a second rectifier circuit, a power factor correction (PFC) stage, a first flyback converter, a second flyback converter, and a microcontroller. The rectifier circuits are configured to receive phase-cut signals from respective dimmer circuits as inputs and output respective phase-cut rectified power signals. The PFC stage is configured to receive a sum of the phase-cut rectified power signals as input and output a power-factor corrected electrical power to the flyback converters. The flyback converters are connected in parallel and are configured to power respective loads including a respective solid-state light emitter. The microcontroller is configured to receive signals derived from the phase-cut signals as inputs and to output respective pulse-width modulation (PWM) control signals to each of the flyback converters. Each flyback converter receives a respective power output portion of the power-factor corrected electrical power in accordance with the respective PWM control signals.

Systems and methods for pulsing high intensity narrow spectrum light are provided. In one example embodiment, a lighting system includes can include one or more high intensity narrow spectrum light sources configured to emit high intensity narrow spectrum light. The lighting system can further include a power circuit configured to provide power to the one or more high intensity narrow spectrum light sources and a pulsing circuit configured to control delivery of power to the one or more high intensity narrow spectrum light sources so as to pulse the emission of high intensity narrow spectrum light from the one or more high intensity narrow spectrum light sources.

A lighting module includes a heat sink with a sidewall and a partition defining two cavities, a LED light source disposed in one cavity to emit light, a driver module disposed in the other cavity with driver circuitry to provide electrical power to the light source, and an optical assembly to provide a desired emission profile. The optical assembly is field-changeable and includes a cover lens with snap-fit connectors to facilitate removal and replacement. The optical assembly further includes either a reflector coupled to the cover lens or an optical lens coupled to the heat sink via an optic holder. In some examples, the driver circuitry facilitates dimming of the light source. The heat sink also dissipates heat generated by the light source and the driver circuitry to maintain desired operating temperatures and thereby facilitate increased light output.

The present invention provides a power adaptor for an LED lamp, and an LED lamp system, each of which may achieve the function of light dimming in a current LED lamp without having to modify its original structure(s) wherein the current LED lamp originally could not have the function, or may achieve better dimming control of parallel-connected LED lamps. The power adaptor comprises a power conversion circuit and a dimmer, wherein the power conversion circuit is configured to receive and then convert an external power supply signal into a power signal; and the dimmer is configured to receive the power signal and a dimming instruction and to combine or synthesize the power signal and the dimming instruction to produce an output signal. The LED lamp receives the output signal and performs control of itself according to the manner of controlling provided by a control code in the output signal.

A wireless enabled lighting device having the ability to retrieve credentials for a primary wireless LAN from another previously configured wireless enabled lighting device is disclosed. After installation, the lighting device may be instructed to join a secondary wireless network temporarily provided by the previously configured lighting device. Once connected to the secondary wireless network, the lighting device may be provided the credentials for the primary wireless LAN from the previously installed device. The lighting device may then join the primary wireless LAN based on the provided credentials and may automatically initiate enrollment with a remote cloud service. After enrollment, the lighting device may be instructed to operate as an access point for the secondary wireless network, thereby allowing a subsequently installed lighting device to retrieve the credentials for the primary wireless LAN from the newly enrolled lighting device.

A buffer circuit for an LED driver circuit, a LED driver circuit, and a control method, the buffer circuit includes a first control switch connected in series in a rectified input loop and a feedback control module connected to the rectified input loop to obtain a loop current in the rectified input loop for generating a first control signal to the first control switch according to the loop current and a reference signal. The first control switch switches between a fully conducting state and a non-fully-conducting state based on the first control signal and restrains the loop current when the first control switch is in the non-fully-conducting state. The buffer circuit enhances the effect of restraining the current change rate and can effectively restrain current spikes in a circuit, resulting in higher safety and reliability.

A control device may be configured to control one or more electrical loads in a load control system. The control device may be a wall-mounted device such as dimmer switch, a remote control device, or a retrofit remote control device. The control device may include a gesture-based user interface for applying advanced control over the one or more electrical loads. The types of control may include absolute and relative control, intensity and color control, preset, zone, or operational mode selection, etc. Feedback may be provided on the control device regarding a status of the one or more electrical loads or the control device.

A leakage protection circuit and a dimming drive circuit are provided. A leakage detection circuit is configured to detect whether leakage occurs between two input terminals that receive an external signal. When leakage occurs, leakage protection measures are taken. A pulse generation circuit receives the sampling signal characterizing the voltage between the two input terminals to compare the sampling signal with two thresholds to control a detection path of the leakage detection circuit to be turned on or off according to a comparison result. The leakage detection path is enabled to be turned on twice by setting two pulse signals in a power frequency period, which can consider the leakage detection of the front-edge phase-cutting dimming and rear-edge phase-cutting dimming of the dimming drive circuit and has a wide range of applications.

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 regulation circuit coupled to a cathode of one or more light emitting diodes. The one or more light emitting diodes include the cathode and an anode configured to receive a rectified voltage. Additionally, the system includes a control circuit coupled to the cathode of the one or more light emitting diodes. The control circuit is configured to receive a first voltage from the cathode of the one or more light emitting diodes, compare a second voltage and a threshold voltage, and generate a control signal based at least in part on the second voltage and the threshold voltage. The second voltage indicates a magnitude of the first voltage.

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 regulation circuit coupled to a cathode of one or more light emitting diodes. The one or more light emitting diodes include the cathode and an anode configured to receive a rectified voltage. Additionally, the system includes a control circuit coupled to the cathode of the one or more light emitting diodes. The control circuit is configured to receive a first voltage from the cathode of the one or more light emitting diodes, compare a second voltage and a threshold voltage, and generate a control signal based at least in part on the second voltage and the threshold voltage. The second voltage indicates a magnitude of the first voltage.