Single channel digital addressable lighting interface (DALI) systems can include a dedicated external power supply that operates in a constant voltage/constant current mode to meet requirements of the DALI bus. A lighting controller is powered from the DALI bus. In one embodiment of the inventive subject matter, a lighting system is provided that includes two or more control (e.g., DALI) buses and a multichannel power supply that can be used for powering a controller of the system with constant voltage and to power separate control buses with separate and constant current. In order to protect the controller and buses from overloads caused by miswiring or other erroneous conditions, a protection circuit assembly is provided.

System controller and method for a power converter. For example, a system controller for a power converter includes a logic controller configured to generate a modulation signal, and a driver configured to receive the modulation signal, generate a drive signal based at least in part on the modulation signal, and output the drive signal to a switch to affect a current flowing through an inductive winding for a power converter. Additionally, the system controller includes a voltage-to-voltage converter configured to receive a first voltage signal, the modulation signal, and a demagnetization signal, and to generate a second voltage signal based at least in part on the first voltage signal, the modulation signal, and the demagnetization signal.

The present invention discloses an LED torchiere lamp with overheat and overvoltage protection functions. The LED torchiere lamp includes primarily a high-voltage rectifying circuit which rectifies high-voltage alternating current as high-voltage direct current, and an IC drive circuit. The IC drive circuit is built in with an electronic switching circuit to drive the LED lamp, an analog light dimmer circuit and a PWM light dimmer circuit, in addition to an overheat and overvoltage protection circuit which is used to improve the safety of and extend the lifetime of usage of the LED torchiere lamp, thereby having the practicality.

A lighting status signaling system including a lighting fixture having a light, a light driver connected to the light, and a monitor circuit connected to the light and to the light driver. The monitor circuit is configured to monitor a voltage level at an output of the light driver. A sensing circuit is coupled to the monitor circuit via a sensing wire independent of a power wire to the lighting fixture. A lighting controller is connected to the sensing circuit via the sensing wire and configured to determine a lighting status of the lighting fixture.

An LED replacement lamp (20) is described. An LED lighting assembly (40) comprising LED lighting elements is electrically connected to filament emulation circuits, connected to electrical contacts at each of two opposite ends (22a, 22b) of an elongated member. The filament emulation circuits (42) each comprise a first resistor circuit (46) and a second resistor circuit (48) connected to first and second electrical contacts (26a, 24a). The first and second resistor circuits (46, 48) are connected to the LED lighting assembly (40) at a common terminal (50). In order to provide an LED replacement lamp for safe operation even in cases of component failure, and if the replacement lamp (20) is used in incorrect wiring configurations, the first and second resistor circuits (46, 48) each comprise a series connection of at least two resistors, in such a way that in case of failure of one of the resistors, the total resistance of the filament emulation circuits (42) remains above a determined resistance value.

The invention is related to a luminaire comprising a lighting module for emitting light, a driver for driving operation of the lighting module, a runtime overvoltage protection device for protecting the lighting module and the driver from exposure to overvoltage above a first overvoltage tripping limit, and a provisional overvoltage protection device that is connected in parallel to the runtime overvoltage protection device and has a second overvoltage tripping limit. The second tripping limit smaller than the first overvoltage tripping limit so that the provisional overvoltage protection device provides overvoltage protection to the runtime overvoltage protection device. Moreover, the provisional overvoltage protection device is deactivatable.

An exterior aircraft light includes a mounting board, having an upper side, a lower side and a plurality of side faces; at least one LED, arranged on the upper side of the mounting board; and a mounting board enclosure and lens structure, wherein the mounting board enclosure and lens structure comprises a lens arranged over the at least one LED for shaping an output light intensity distribution of the exterior aircraft light and a covering layer arranged on the upper side, the lower side and the plurality of side faces of the mounting board, wherein the mounting board enclosure and lens structure is an integral silicone structure.

A solid state lighting system includes a number of light sources with multiple light colors that can be used to replace fluorescent lamps.

An emergency LED lighting system maintains power to an LED lighting source based on measured voltages and currents provided to the LED lighting source; rolls back or decreases power provided to an LED lighting source over time in order to increase the amount of time the battery can power the LED lighting source; executes a soft start procedure, such that the power provided to the LED lighting source is gradually ramped up during activation of the LED lighting sources; identifies a type of battery coupled to the emergency LED lighting system; cycles the emergency LED lighting system between charging mode and standby mode to reduce power consumption over a window of time; detects AC power or an absence of AC power; and/or uses a status LED to communicate information about the emergency LED lighting system with a remote device.

An illumination device and method is provided herein for calibrating individual LEDs in the illumination device, so as to obtain a desired luminous flux and a desired chromaticity of the device over changes in drive current, temperature, and over time as the LEDs age. The calibration method may include subjecting the illumination device to a first ambient temperature, successively applying at least three different drive currents to a first LED to produce illumination at three or more different levels of brightness, obtaining a plurality of optical measurements from the illumination produced by the first LED at each of the at least three different drive currents, obtaining a plurality of electrical measurements from the photodetector and storing results of the obtaining steps within the illumination device to calibrate the first LED at the first ambient temperature. The plurality of optical measurements may generally include luminous flux and chromaticity, the plurality of electrical measurements may generally include induced photocurrents and forward voltages, and the calibration method steps may be repeated for each LED included within the illumination device and upon subjecting the illumination device to a second ambient temperature.