The disclosure is directed to an obstruction lighting and power line control system. The system includes at least one light source, at least one controller coupled to and configured to control the at least one light source, a power line cable providing power to the at least one light source, and a power supply coupled to the power line cable and configured to provide power to the at least one light source over the power line cable. The disclosure further includes a system controller configured to control the power supply to provide power over the power line cable to the at least one light source and the at least one controller that indicates at least one of the following: operating parameters and operating modes.

An LED tube lamp comprises a plurality of LED light sources, two end caps, a lamp tube, and an LED light strip. The lamp tube extends in a first direction along a length of the lamp tube, and has two ends respectively sleeved to the end caps. The LED light strip is disposed inside the lamp tube, and the LED light sources are on the LED light strip. Each end cap comprises an electrically insulating tube and a magnetic metal member. The magnetic metal member is fixedly on an inner circumferential surface of the electrically insulating tube and interposed between the electrically insulating tube and the end of the lamp tube. The LED tube lamp further comprises a hot melt adhesive on the inner surface of the magnetic metal member and adhered to the outer peripheral surface of the end of the lamp tube.

A processor controlled induction RF fluorescent lamp, where the control processor runs a load control algorithm at least for switching the electrical load for connection to an external dimming device, the lamp comprising a vitreous envelope filled with an ionizable gas mixture; a power coupler comprising at least one winding of an electrical conductor; and an electronic ballast providing appropriate voltage and current to the power coupler.

An LED tube lamp is provided herein, which implements the safety function for protecting the user from electric shock since it conducts only when both ends thereof have been correctly installed into a lamp socket. The LED tube lamp includes an installation detection module configured in the LED tube lamp to detect an installation state between the LED tube lamp and the lamp socket. The installation detection module includes: a detection pulse generating module, configured to generate a first pulse signal; a detection result latching circuit, configured to receive and output the first pulse signal; a switch circuit, configured to receive the first pulse signal from the detection result latching circuit, and configured to maintain a conductive state of the switch circuit during the first pulse to cause a power loop of the LED tube lamp to be conductive; and a detection determining circuit, configured to detect a first sampling signal on the power loop so as to determine the installation state between the LED tube lamp and the lamp socket.

A driver circuit provides current to a light source from a resonant tank having a single inductive element. The driver circuit is coupled to DC power source having a power rail and a ground, and includes a power inverter providing AC input to the tank, which further includes a DC blocking capacitor and a primary winding of the inductive element coupled in series between the output of the inverter and the ground. A leakage inductance of the inductive element provides resonant inductance for the tank. The inductive element further distributes power output from the resonant tank to a plurality of secondary windings coupled to an output rectifier. A resonant capacitor coupled across output ends of the secondary windings provides resonant capacitance for the tank. The output voltages across the secondary windings are clamped to a value based in part on a turns ratio between respective secondary windings.

A control scheme for a dimmable lighting driver is provided. The control scheme may operate with a phase cut type dimmer (leading or trailing edge). In an embodiment, the control scheme is programmed or otherwise configured into a controller as a control algorithm. The control algorithm is configured to measure phase cut and zero crossing angles of the input mains waveform, and to subsequently maintain constant LED current commensurate with a user-set dimming level, with no flicker. The control algorithm may be implemented in software, such as a firmware-based routine executable by one or more controllers of a given driver. The one or more controllers may be, for example, an existing general purpose controller of the given driver, or a dedicated dimming controller. Numerous configurations will be apparent in light of this disclosure.

An LED tube lamp includes a lamp tube, two end caps, and an LED light strip. The two end caps are respectively at two opposite ends of the lamp tube. The LED light strip is in the lamp tube and is provided with one or more LED light sources mounted thereon. Each of the end caps includes an electrically insulating tube, two conductive pins, and two or more heat-dissipating openings. The two conductive pins are disposed on the electrically insulating tube. The two heat-dissipating openings are formed on the electrically insulating tube and are symmetric to each other with respect to a vertical central plane passing through the middle of a line connecting the two conductive pins.

A backlight unit includes a light source; and a light-source driving unit configured to drive the light source and that includes a transformer. The transformer includes a core comprising a plurality of metal powders; and a plurality of coils embedded in the core. At least one coil has a diameter different from a diameter of another coil.

An LED lighting apparatus according to exemplary embodiments includes a rectification circuit configured to rectify a modulated AC voltage to generate a drive voltage, an LED driving module connected to a plurality of LED groups and configured to apply a drive current to at least one of the plurality of LED groups according to a level of the drive voltage, and a dimming level detector configured to detect a dimming level corresponding to the drive voltage. The LED driving module is configured to compare the detected dimming level to a reference value and block the drive current based on a result of the comparison.

Photographic lighting devices, systems, and methods having multiple electrical energy storage/discharge (EESD) elements and/or multiple light sources in a single photographic lighting device to perform one or more photographic lighting effects. Multiple EESD elements and multiple light sources can be configured to have two separate light emissions occur in a single image acquisition window. In one exemplary aspect, independent control of one or more light sources connected to a first EESD bank and another one or more light sources connected to a second EESD bank, such as via control circuitry, may be utilized in producing various lighting effects.