Methods, devices, and systems for a current converter circuit for airfield ground lighting are described herein. In some examples, one or more embodiments include a bi-directional switch, an inductor to store energy in response to the bi-directional switch being on, and an output capacitor to discharge power to an LED, where the bi-directional switch can switch off to cause the inductor to discharge to the output capacitor in response to a voltage across the output capacitor being less than a threshold voltage.

A method that includes the following steps: determination of predictive meteorological data in a region surrounding the facility; querying of a database about the presence of birds in the region surrounding the facility; calculation, by a prediction unit, of the probability of birds passing opposite the facility as a function of time, on the basis of the predictive meteorological data and data relating to the presence of birds in the region surrounding the facility; and control, by a control unit, of at least one light source of the facility, on a basis of the probability of passage, calculated by the prediction unit.

This disclosure describes, in part, voice-controlled light dimmers that act as voice-controlled endpoints at which users may provide voice commands. These light dimmers include a front panel module coupled to a power module using a hardware interface. The front panel module may receive input from a user indicating commands for controlling appliances, and send communications to the power module using the hardware interface to control the appliances. In some examples, the communications involve encrypted data sent using an inter-integrated circuit (I2C) protocol using the hardware interface to an electrically isolated power module. The power provided to the appliances may be controlled by the power module of the voice-controlled light dimmer.

In an example, a method of operating an ultraviolet (UV) light source includes providing a supply power to the UV light source, and activating, using the supply power, the UV light source to emit UV light during a series of activation cycles. The method also includes, during at least one activation cycle in the series, sensing the UV light emitted by the UV light source to measure an optical parameter of the UV light. The optical parameter is related to an antimicrobial efficacy of the UV light. The method further includes adjusting, based on the measured optical parameter, an electrical parameter of the supply power to maintain a target antimicrobial efficacy of the UV light over the series of activation cycles.

A dimmer control circuit for controlling a phase cut dimmer includes: a rectifier circuitry, configured to rectify the output voltage of the phase cut dimmer to output a rectified voltage; an input voltage detecting circuitry, configured to output a detected voltage according to the rectified voltage; a processor, configured to output a control signal when the detected voltage meets a preset condition; and a constant current circuitry, configured to output or stop outputting a preset current to the rectifier circuitry in response to the control signal; wherein the preset current has a value greater than a holding current of the phase cut dimmer.

A light source apparatus including a light-emitting module and a control unit is provided. The light-emitting module is configured to provide a light. The control unit is configured to make the light switched between a first light and a second light so that at least one of a blue-light hazard and a circadian stimulus value of the light is changed. A wavelength of a blue light main peak in a spectrum of the first light is different from a wavelength of a blue light main peak in a spectrum of the second light.

A gaseous-phase ionizing radiation generator for the voltage controlled production, flux, and use of one or more forms of ionizing electromagnetic and/or particulate radiation including: embodiments to collect and convert the particulate radiation that is generated by the radiation generator into electricity; embodiments that generate electricity from the ionized gas within the radiation generator by means of an auxiliary electrode structure composed of interdigitated individual electrodes of alternating work function; and a method or procedure for the fabrication and the activation of at least one working electrode composed in part of a metal hydride host material that is not formally considered to be radioactive.

A gaseous-phase ionizing radiation generator for the voltage controlled production, flux, and use of one or more forms of ionizing electromagnetic and/or particulate radiation including: embodiments to collect and convert the particulate radiation that is generated by the radiation generator into electricity; embodiments that generate electricity from the ionized gas within the radiation generator by means of an auxiliary electrode structure composed of interdigitated individual electrodes of alternating work function; and a method or procedure for the fabrication and the activation of at least one working electrode composed in part of a metal hydride host material that is not formally considered to be radioactive.

A mode switching circuit is configured to change a signal path in a light-emitting diode (LED) tube lamp and comprises: at least one switch, configured to receive a filtered signal as a driving signal to drive an LED module in the LED tube lamp to emit light, and when a frequency of an external driving signal received by the LED tube lamp is higher than a mode switching frequency, output the driving signal to the LED module. The LED tube lamp comprises an auxiliary power module coupled to provide auxiliary power for the LED module to emit light; and the mode switching circuit is on a printed circuit board and is electrically connected to the LED module on a bendable circuit sheet in the LED tube lamp, wherein the bendable circuit sheet is disposed below the printed circuit board to be electrically connected to the printed circuit board by soldering.

A lighting device controlling circuit includes: a first switching module arranged to receive a button signal, wherein the first switching module is selectively opened or closed according to the button signal; a signal processing module coupled to the first switching module for processing the button signal to generate an adjusting signal; and a power converting module coupled to the signal processing module for changing an illuminating mode of a lighting device according to the adjusting signal.