Methods and apparatus for implementing a control apparatus for a light fixture for externally controlling the current to the LED light emitter of a landscape LED light fixture. In an exemplary embodiment a control apparatus for controlling current to an LED light source in a landscape lighting device includes an LED driver, a user control with a control setting indicator, and a driver housing including setting indicators.

An integrated single stage ac-dc driver for powering LED loads includes a boost converter operating in a Discontinuous Conduction Mode, DCM, comprising a half-bridge, and a Zeta Asymmetrical Half Bridge, ZAHB, integrated with the boost converter such that the boost converter and the ZAHB share the half-bridge to perform power factor control, PFC, with a fixed duty cycle and control an output voltage.

The present disclosure relates to a method for sanitization of a surface by emission of a plurality of sanitization wavelengths, and to a device for implementing the method. The method comprises emitting light using first LEDs configured to emit the sanitization wavelengths, receiving, by a circuit, a feedback signal from a light sensor indicating a light intensity received by the light sensor during the light emission, and controlling the first LEDs with the circuit based on the feedback signal.

A load control device for controlling the power delivered from an AC power source to an electrical load includes a thyristor, a gate coupling circuit for conducting a gate current through a gate of the thyristor, and a control circuit for controlling the gate coupling circuit to conduct the gate current through a first current path to render the thyristor conductive at a firing time during a half cycle. The gate coupling circuit is able to conduct the gate current through the first current path again after the firing time, but the gate current is not able to be conducted through the gate from a transition time before the end of the half-cycle until approximately the end of the half-cycle. The load current is able to be conducted through a second current path to the electrical load after the transition time until approximately the end of the half-cycle.

A buck boost system for allowing LED devices to be driven from a longer distance. The boost device boosts the voltage level to a higher level than that used by the eventual LED device. The buck device is powered from that higher voltage, and also reduces the voltage level to a level used by the LED device.

A buck boost system for allowing LED devices to be driven from a longer distance. The boost device boosts the voltage level to a higher level than that used by the eventual LED device. The buck device is powered from that higher voltage, and also reduces the voltage level to a level used by the LED device.

A device and a method for providing an electrical current to an electrical load is disclosed. In particular, the device comprises a memory storage device for storing a plurality of ideal voltage waveforms; an electronic controller arranged in data communication with the memory storage device, the electronic controller operable to select one of the plurality of ideal voltage waveforms to compute a reference voltage and a switching period based on a predetermined rule; and an electronic switch arranged to receive the switching period to switch the electronic switch between an on state and an off state, wherein the electrical current is calculated based on a function of the reference voltage and the switching period of the electronic switch.

A lighting apparatus includes a top cover, a bottom cover, a light passing cover, a battery, a power circuit, a power switch and a light source plate. The top cover has an opening part for defining a light opening. The bottom cover is fixed to the top cover forming a containing space. The light passing cover has a larger diameter than the light opening. A peripheral edge of the light passing cover engages an inner surface of the opening part of the top cover. The battery is stored in the container space. The power circuit is connected to the battery for providing a current to the LED modules of the light source plate. The power switch is connected to the power circuit to control the LED modules. The light source plate has a top side mounted with multiple LED modules.

A light emitting element driving circuit (2) according to the present disclosure includes a constant current circuit (10), a switch (20), and a booster circuit (30). The constant current circuit (10) supplies a constant current (Ia) from a power supply voltage (Vcc) to a light emitting element (3). The switch (20) disconnects or connects a current (I1) flowing through the light emitting element (3) based on an external signal. The booster circuit (30) boosts a voltage between the power supply voltage (Vcc) and the light emitting element (3) in synchronization with a timing at which the light emitting element (3) is turned on.

A two-way load control system comprises a power device, such as a load control device for controlling an electrical load receiving power from an AC power source, and a controller adapted to be coupled in series between the source and the power device. The load control system may be installed without requiring any additional wires to be run, and is easily configured without the need for a computer or an advanced commissioning procedure. The power device receives both power and communication over two wires. The controller generates a phase-control voltage and transmits a forward digital message to the power device by encoding digital information in timing edges of the phase-control voltage. The power device transmits a reverse digital message to the controller via the power wiring.