A light emitting diode (LED) running light comprises a current sink and a plurality of series coupled LED block cells; each of the plurality of LED block cells comprising a LED and a bypass circuit to the current sink, wherein each series coupled LED sequentially turns on (lights) when a voltage source increases by additive voltage increments of at least the turn-on voltage of each LED in the series coupled string until all LEDs are on (lit). The current sink maintains a desired current value through the LEDs and may also be used to provide waveforms for diagnostic and timing purposes.

There is provided a lens for a light emitter which includes: a bottom surface; an incident surface connected to the bottom surface at a central region of the bottom surface and disposed on or above a light source to allow light emitted from the light source to be made incident thereto and travel in an interior of the lens; and an output surface connected to the bottom surface at an edge of the bottom surface and configured to allow the light which has traveled in the interior of the lens to be emitted outwardly therefrom, wherein the central region of the bottom surface protrudes with respect to the other region of the bottom surface.

Driver circuitry is coupled between a power supply and at least one LED in a solid-state lighting fixture, such that a non-isolated direct current (DC) path exists between the power supply and the at least one LED. The driver circuitry is configured to receive an AC input voltage and generate a driver output current for driving the at least one LED from the AC input voltage. By using driver circuitry that is non-isolated from the at least one LED in the solid-state lighting fixture, the efficiency of the driver circuitry may be increased, while simultaneously reducing the cost and complexity of the driver circuitry compared to conventional driver circuitry.

A head mounted device includes a helmet, an ambient light sensor, a pupil dimension sensor, a lighting element, and a dynamic lighting system. The ambient light sensor is disposed in an outside surface of the helmet and measures ambient light outside the helmet. The pupil dimension sensor is disposed in a housing of the helmet and measures a size of a pupil of a wearer of the helmet. The lighting element is disposed in the outside surface of the helmet. The dynamic lighting system controls the lighting element and adjusts an intensity of the lighting element based on the ambient light and the pupil size of the wearer of the helmet.

The current adjustment apparatus includes a communication interface, a current generating module, and a current adjustment module. The current generating module includes a microprocessor, a memory for storing a current setting parameter, and a current generating unit; the memory and the current generating unit are electrically connected to the microprocessor. When the current adjustment module is not physically connected to the current generating module, the microprocessor makes the current generating unit generate a driving current in response to the current setting parameter; when the current adjustment module is physically connected to the current generating module via the communication interface, the microprocessor makes the current generating unit generate the driving current in accordance with a setting signal from the current adjustment module, and the microprocessor further overwrites the current setting parameter in accordance with the setting signal when receives a writing signal.

An LED driver circuit controls the currents through a plurality of strings of light-emitting diodes (LEDs), which are connected in series. Each LED string has an associated current regulator. The LED strings are connected between the voltage rail and a reference rail on the output of an AC-to-DC rectifier to receive an unfiltered rectified DC voltage. A first current regulator is active during a first voltage range of the DC voltage to provide a current of a first magnitude to a first LED string only. A second current regulator is active during a second voltage range to provide a current of a second magnitude to the first LED string and to a second LED string. A third current regulator is active during a third voltage range to provide a current of a third magnitude to the first LED string, to the second LED string and to a third LED string.

A method of controlling a dimmable light emitting diode (LED) system includes defining two or more dimming regions having respective dimming levels applied to one or more strings of LEDs, continuously supplying a current to the one or more strings of LEDs in a first dimming region, and maintaining an average peak value of the current substantially the same and adjusting a duty cycle of a pulse width modulation (PWM) control signal in a second dimming region to supply the current according to the PWM control signal.

Described herein is a method for marking luminaires, particularly traffic route luminaires, in a luminaire network, the network being controllable via a server. Each luminaire is provided, in its operational state, with a controller (2) for controlling its operation and a mark that is visually recognizable from the outside the luminaire. The mark is formed by an information storage medium (4), in particular, and can be used to identify the luminaire. The mark is linked to the controller (2) or to the luminaire to be controlled by the controller before the mark is added to the luminaire.

A stepless dimming control method of a lighting system is applicable to the situations where a light source for a lighting terminal is a fluorescent lamp and/or an LED lamp. A pulsating voltage regulating device is connected in series with a main power supply circuit of a terminal light source. A dimming control unit is configured for a fluorescent lamp electronic ballast/LED driving unit. The specific method includes: at first, fluctuating a supply voltage value at an input end of the electronic ballast/LED driving unit for a short time by the pulsating voltage regulating device, and then regulating, by the dimming control unit, an output frequency of the electronic ballast and an output current of the LED driving unit according to fluctuation parameters and also in combination with preset system settings, so as to realize dimming. The method can realize remote and stepless dimming, is applicable to the terminal light sources of both fluorescent lamps and LED lamps, has good interference resistance and relatively low system construction/improvement costs, and is extremely suitable for newly-built lighting systems and for use in upgrading existing lighting systems.

A controllable driver (1) is provided for driving a load. The controllable driver (1) comprises a primary converter (11) and a control circuit (13) isolated from one another by an opto-isolator (18). The controllable driver (11) is isolated from an output load (19) by a magnetically coupled pair of windings (112, 114); wherein said windings are adapted to provide a voltage supply to said output load. A feedback signal from the output load, indicative of a load current flowing in the second winding, is provided to the control circuit by a winding (12) isolated from the first and second windings (112, 114), such that the control circuit (13) remains isolated from the output load. The control circuit also directly receive input control signal without an opto-isolator. The control circuit is also isolated from the switching core (111) of the primary converter (11) via an opto-isolator. Such a controllable driver reduces the likelihood and impact of electromagnetic interference test failures and potential energy surges.