Systems and methods are disclosed herein for monitoring light emissions in electronic devices. The disclosed techniques herein provide for determining a display duration of display devices for a user. Light emission profiles for each of the display devices are determined. A cumulative emissions exposure is determined that is based on the light emission profiles for the display devices and the display duration of the display devices for the user. A determination is made whether the cumulative emissions exposure exceeds a light emission exposure limit set for the user. In a positive determination, an instruction is transmitted to the display devices for execution of a remedial action based on predefined rules.

A light-emitting diode (LED) luminaire control system comprising a rechargeable battery and a control and test circuit is adopted to provide an emergency power to operate a luminaire that works only in alternate-current (AC) mains. The luminaire comprises LED arrays and a power supply. The LED luminaire control system further comprises a current-fed converter circuit, a control and test unit, a relay switch, a local controller, a remote controller, and a receiver circuit. When a battery discharging test is initiated by the remote controller with a band-pass signal transmitted, the receiver circuit can detect such a signal and subsequently send a decoded command to the LED luminaire control system to execute such a test by operating the luminaire without uncertainty.

The present disclosure provides an LED straight light including a light tube with two pins at both ends, an LED installed in the light tube and a driving circuit. The driving circuit includes a mains branch and a signal branch. The mains branch is coupled to the pins at one end of the light tube for transmitting power to the LED for power supply. The signal branch is coupled to the pins at the other end of the light tube for transmitting external driving signals to control the on/off of the mains branch. The LED straight light of the present disclosure is powered by two ends, one of the two ends supplies power to the LED through the mains branch, and the other end receives driving signals to control the on/off of the mains branch.

The present disclosure provides an LED straight light including a light tube with two pins at both ends, an LED installed in the light tube and a driving circuit. The driving circuit includes a mains branch and a signal branch. The mains branch is coupled to the pins at one end of the light tube for transmitting power to the LED for power supply. The signal branch is coupled to the pins at the other end of the light tube for transmitting external driving signals to control the on/off of the mains branch. The LED straight light of the present disclosure is powered by two ends, one of the two ends supplies power to the LED through the mains branch, and the other end receives driving signals to control the on/off of the mains branch.

Provided is a lighting driving circuit for supplying power to a plurality of LED channels, having an input-output synchronous switch circuit synchronously connected to an input and an output of the lighting driving circuit, a rectifier circuit, a power conversion circuit, a power output having an output capacitor, and a discharge circuit connected to the switch circuit and an input end of the rectifier circuit and to the output capacitor. The plurality of LED channels are connected between the power output and the switch circuit, and the switch circuit is configured to simultaneously perform a switching operation of the power supplied to the plurality of LED channels to remove any inrush current to the LED load and send a sense signal to the discharge circuit to discharge the output capacitor.

A circuit board arrangement assembled by at least a first and a second circuit boards, each circuit board comprising: a portion of a circuit; and a first and a second electrical terminals to be electrically connected to a respective first and a second electrical terminals of the other circuit board of the first and the second circuit boards, so as to couple the portions of the circuit of the first and the second circuit boards, wherein the first and second electrical terminals on the circuit board are coupled with each other via the portion of the circuit on the other circuit board of the first and the second circuit boards, at least one board further comprising: a voltage suppression element (TSS1, TSS2) in the board connected across the first and second electrical terminals of the board, said voltage suppression element (TSS1, TSS2) is adapted to become conductive when a voltage thereacross reaches a threshold; characterized in that the portion of the circuit comprising at least one LED, and said LED (LED1) of the first circuit board (B1) and said LED (LED4) of the second circuit board (B2) are forwarded in the same direction and to be series connected between a first interconnection (LED+) of the first electrical terminals of the first and the second circuit boards and a second interconnection (LED−) of the second electrical terminal of the first and the second circuit boards. The voltage suppression element is able to prevent overvoltage/arcing due to a disconnection of the series connection of the LEDs of the first and second circuit boards, as well as a disconnection of a interconnection of first terminals, and a interconnection of the second terminals.

LED lamp assembly comprising a safety switch, a plurality of connector pins arranged at first and second ends of the LED lamp assembly, the connector pins being adapted for electrical connection to a lamp fixture, a plurality of filament simulation circuits, wherein at least one of the connector pins at each of the first and second ends is electrically coupled to a corresponding one of the filament simulation circuits, a plurality of rectifier circuits, one or more LEDs electrically coupled to an output of the rectifier circuits, and a safety switch control circuit operatively coupled to the safety switch. At least one of the connector pins at the first end is electrically coupled via the safety switch to an input of a first one of the rectifier circuits, and at least one of the connector pins at the second end is electrically coupled to an input of a second one of the rectifier circuits. The safety switch control circuit is arranged to close the safety switch when it detects electrical power having a frequency above a predetermined threshold at the connector pins at the first or second ends of the LED lamp assembly.

A lighting apparatus, for example for applications in the show-business or entertainment sector, including: a light-radiation generator, for example a laser generator, configured for projecting a lighting beam towards a lighting space in a certain direction; control circuitry of the light-radiation generator configured for controlling emission of the lighting beam by the light-radiation generator; and processing circuitry configured for calculating a thermal retinal radiance ratio of the light-radiation generator as a function of a distance from the light-radiation generator in the aforesaid direction and for acting on the control circuitry of the light-radiation generator in order to control the lighting beam of the light-radiation generator as a function of the thermal retinal radiance ratio, with the aim of maintaining the aforesaid thermal retinal radiance ratio below unity starting from a certain value of distance from the light-radiation generator in the aforesaid direction.

A lighting apparatus for show-business or entertainment sector comprises a light-radiation generator for projecting a lighting beam towards a lighting space that includes one or more undesired lighting zones. A motorization causes the lighting beam to scan the lighting space as a function of scanning-control signals as received by the lighting apparatus. Driving circuitry is provided, configured to control emission of the lighting beam, as well as processing circuitry configured to sense the scanning-control signals received and the scanning position of the lighting beam of the light-radiation generator. As a result of the detection of received scanning-control signals that can lead the lighting beam to being brought into the undesired lighting zone, the processing circuitry acts on the motorization and/or on the driving circuitry of the light-radiation generator, containing projection of the lighting beam directed towards the undesired lighting zone and preventing possible risks of a photobiological nature.

A lamp including a light source having at least one string of light emitting diodes on a printed circuit board present within a tube body; and end caps having a G13 pin layout on each end of the tube body. The lamp may further include an electrical isolation switch mounted on at least one of the end caps, wherein the electrical isolation switch provides shock protection from the lamp when installed into a ballast free fixture. The lamp may further include driver electronics having a filament detector portion provided by a passive resistance capacitor (RC) circuit that simulates the filament load of a fluorescent lamp when installed into a ballast containing fixture.