Abstract: A device for controlling levels of light output by a solid state lighting load at low dimming levels includes a bleed circuit connected in parallel with the solid state lighting load. The bleed circuit includes a resistor and a transistor connected in series, the transistor being configured to turn on and off in accordance with a duty cycle of a digital control signal when a dimming level set by a dimmer is less than a predetermined first threshold, decreasing an effective resistance of the bleed circuit as the dimming level decreases.

Abstract: A device for controlling levels of light output by a solid state lighting load at low dimming levels includes a bleed circuit connected in parallel with the solid state lighting load. The bleed circuit includes a resistor and a transistor connected in series, the transistor being configured to turn on and off in accordance with a duty cycle of a digital control signal when a dimming level set by a dimmer is less than a predetermined first threshold, decreasing an effective resistance of the bleed circuit as the dimming level decreases.

Abstract: A system for controlling a level of light output by a solid state lighting load controlled by a dimmer includes a phase angle detector and a power converter. The phase angle detector is configured to detect a phase angle of the dimmer based on a rectified voltage from the dimmer and to determine a power control signal based on comparison of the detected phase angle with a predetermined first threshold. The power converter is configured to provide an output voltage to the solid state lighting load, the power converter operating in an open loop mode based on the rectified voltage from the dimmer when the detected phase angle is greater than the first threshold, and operating in a closed loop mode based on the rectified voltage from the dimmer and the determined power control signal from the detection circuit when the detected phase angle is less than the first threshold.

Abstract: A device for controlling levels of light output by a solid state lighting load at low dimming levels includes a bleed circuit connected in parallel with the solid state lighting load. The bleed circuit includes a resistor and a transistor connected in series, the transistor being configured to turn on and off in accordance with a duty cycle of a digital control signal when a dimming level set by a dimmer is less than a predetermined first threshold, decreasing an effective resistance of the bleed circuit as the dimming level decreases.

Abstract: A powerline communication control system for controlling a lighting unit, such as an LED lighting unit, including a master controller for receiving lighting unit control inputs from a lighting controller and generating corresponding lighting unit command outputs in a lighting system command format and transmission mode and superimposing the lighting unit command outputs onto the power distribution system and at least one lighting slave unit for receiving the lighting command signal, separating the lighting command signal from the power signal and for providing lighting unit control commands to the at least one lighting unit to control illumination thereof.

Abstract: An apparatus and method for commissioning a lighting system include monitoring a clock source signal to identify the presence of a feature in the clock source signal, wherein the clock source signal is a power line communication signal carried by an AC or DC signal used to provide power to the plurality of light fixtures, generating a trigger signal with a triggering module in response to identifying the presence of the feature in the clock source signal, providing the trigger signal to each of the plurality of light fixtures to command each of the plurality of light fixtures to stop outputting light, measuring ambient light with the light sensor assigned to each light fixture; and designating each light fixture to a lighting group based on the ambient light measured with the light sensor assigned to each fixture.

Abstract: A powerline communication control system for controlling a lighting unit, such as an LED lighting unit, including a master controller for receiving lighting unit control inputs from a lighting controller and generating corresponding lighting unit command outputs in a lighting system command format and transmission mode and superimposing the lighting unit command outputs onto the power distribution system and at least one lighting slave unit for receiving the lighting command signal, separating the lighting command signal from the power signal and for providing lighting unit control commands to the at least one lighting unit to control illumination thereof.

Abstract: Light fixture systems and application of ambient light measurement for improving lighting system efficiency.

Abstract: An apparatus and method for commissioning a lighting system include monitoring a clock source signal to identify the presence of a feature in the clock source signal, wherein the clock source signal is a power line communication signal carried by an AC or DC signal used to provide power to the plurality of light fixtures, generating a trigger signal with a triggering module in response to identifying the presence of the feature in the clock source signal, providing the trigger signal to each of the plurality of light fixtures to command each of the plurality of light fixtures to stop outputting light, measuring ambient light with the light sensor assigned to each light fixture; and designating each light fixture to a lighting group based on the ambient light measured with the light sensor assigned to each fixture.

Abstract: Light fixture systems and application of ambient light measurement for improving lighting system efficiency.

Abstract: The present disclosure provides a lighting system. In one example, the lighting system comprises a circuit board including plural light emitting sets, each of the light emitting sets including one or more light emitting diodes, plural integrated circuits configured to receive a rectified sine waveform of a power source, and a dimmer circuit electrically coupled to the integrated circuits and configured to transmit a dimming signal to the integrated circuits. Each one of the integrated circuits is electrically coupled to a respective one of the light emitting sets. Each of the integrated circuits is configured to modify the rectified sine waveform into a truncated rectified sine waveform based on the dimming signal. Each of the integrated circuits is configured to turn on or off a number of the light emitting diodes included in a respective one of the light emitting sets based on the truncated rectified sine waveform.

Abstract: The present disclosure provides a lighting system. In one example, the lighting system includes a circuit board including a plurality of light emitting groups and an integrated circuit electrically coupled to the light emitting groups and configured to receive a rectified sine waveform of a power source. The integrated circuit is configured to divide a half cycle of the rectified sine waveform into a plurality of voltage regions. The integrated circuit is also configured to turn on or off a number of the light emitting groups based on a voltage value in one of the voltage regions of the rectified sine waveform.

Abstract: The present disclosure provides a method for adjusting output of a lighting system. In one example, the method comprises providing to an integrated circuit a rectified sine waveform of a power source, providing to the integrated circuit a dimming signal corresponding to a dimming profile, modifying the rectified sine waveform into a truncated rectified sine waveform in accordance with the dimming signal, and selectively turning on or off a number of light emitting diodes in accordance with the truncated rectified sine waveform to produce a light output.

Abstract: The present disclosure provides a lighting system. In one example, the lighting system includes a circuit board including a plurality of light emitting groups, an integrated circuit electrically coupled to the light emitting groups, a rectifier circuit electrically coupled to the integrated circuit and configured to generate a rectified sine waveform of a power source, and a dimmer circuit electrically coupled to the integrated circuit and configured to transmit a dimming signal to the integrated circuit. In one case, the integrated circuit is configured to modify a power current of the light emitting groups to globally control an emission intensity of all of the light emitting groups uniformly in accordance with the dimming signal.

Abstract: A powerline communication control system for controlling a lighting unit, such as an LED lighting unit, including a master controller for receiving lighting unit control inputs from a lighting controller and generating corresponding lighting unit command outputs in a lighting system command format and transmission mode and superimposing the lighting unit command outputs onto the power distribution system and at least one lighting slave unit for receiving the lighting command signal, separating the lighting command signal from the power signal and for providing lighting unit control commands to the at least one lighting unit to control illumination thereof.

Abstract: Disclosed is a light emitting diode (LED)-based lighting fixture including an LED and a voltage supply configured to provide electrical power to the LED. The LED-based lighting fixture also includes a temperature sensor configured to determine a temperature at a selected location of the lighting fixture; and a controller connected between the temperature sensor and the voltage supply and configured to determine an ambient temperature and a drive current based on the ambient temperature and to provide an input voltage to the LED based on the drive current. A method of controlling the operational lifetime of an LED, a computer readable medium and an apparatus are also described.

Abstract: A powerline communication control system for controlling a lighting unit, such as an LED lighting unit, including a master controller for receiving lighting unit control inputs from a lighting controller and generating corresponding lighting unit command outputs in a lighting system command format and transmission mode and superimposing the lighting unit command outputs onto the power distribution system and at least one lighting slave unit for receiving the lighting command signal, separating the lighting command signal from the power signal and for providing lighting unit control commands to the at least one lighting unit to control illumination thereof.

Abstract: A moveable joint suitable for connection with a tubular member including a socket member having an inner surface defining a cavity and a rotation member having an outer surface corresponding to the cavity wherein the rotation member is journaled for rotation in said cavity. The rotation member has an inner surface defining a cylindrical bore through the rotation member and centered on a longitudinal axis of rotation member, the cylindrical bore being configured to receive a tubular member. The moveable joint further includes a releasable locking mechanism for releasably locking a tubular member in the cylindrical bore so that when the tubular member is locked in the cylindrical bore the tubular member and the rotation member are fixed with respect to one another and are rotatable relative to the socket member. The locking mechanism includes a cage connected to the rotation member.

Abstract: In some examples, wireless light controller technology includes methods and apparatuses. In other examples, the technology includes one or more lights on a power line. Each light of the one or more lights is individually controllable via power line communication over the power line. The technology further includes a wireless device configured to transmit wireless communication. The wireless communication includes instructions to control the one or more lights. The technology further includes a wireless light controller configured to receive the wireless communication and transmit the instructions to control the one or more lights over the power line communication to the one or more lights.

Abstract: Systems and methods for identifying a location illuminated by an onboard searchlight on a vehicle are presented. A location of interest is illuminated at an illuminated location illuminated by the onboard searchlight, and a vehicle position of the vehicle and the onboard searchlight is determined. A vehicle orientation of the vehicle is determined based on a pitch, roll, and yaw of the vehicle, and an azimuth and an elevation of the onboard searchlight light is recorded to provide a recorded azimuth and elevation data. A pointing coordinate for the onboard searchlight illuminating the illuminated location is computed based on the vehicle orientation, the vehicle position, and the recorded azimuth and the elevation data, and the illuminated location is calculated based on the pointing coordinate.