Abstract: A current driver circuit, for driving a light source, that provides high accuracy and reduced power consumption is disclosed. The driver includes a digital to analog converter configured to receive a digital value representing a light intensity and convert the digital value to an analog current signal. A current mirror is configured to receive the analog current signal and create a current mirror output which is larger than the analog current signal based on a ratio of the current mirror. This results in a modified analog current signal. A light source receives the modified analog current signal, and responsive thereto generate a light signal such that the light signal has an intensity controlled by the digital value. One or more amplifiers are also part of the current driver and configured to increase response time and accuracy.

Abstract: A lighting device is generally illustrated including a light body having forward facing light sources including a visible white light source, visible colored light source and an infrared light source. Additionally, a side facing light source is provided. The light body also includes switches for activating the visible light sources and a three-position switch for activating the IR light source and the side facing light source. The lighting device further includes boost circuitry for controlling electrical energy supplied to a light source.

Abstract: A method of controlling respective intensity levels of each of N light units, from a first light unit to an Nth light unit. Each of the light units has respective intensity levels from a 0 level to an L level based on duration of illumination of each light unit, In the method, a control signal representing light intensities for each of the N light units, sequentially, in order, for the first light unit to Nth light unit is received and processed. Then, the light units are re-arranged in accordance with the light intensities into a re-arranged order, from level L to level 0. A predetermined time period is counted sequentially through L time intervals. The light units are turned on in the re-arranged order at respective time intervals corresponding to the light intensities; and all light units are turned off at the end of the predetermined time period.

Abstract: A power saving arrangement for use with a phase cut dimmer, the power saving arrangement constituted of: a power converter arranged to convert a received alternating current power signal to a direct current signal; a detector arranged to detect the presence, or absence, of the phase cut dimmer blocking a portion of an alternating current mains power sine wave from reaching the power converter; and a controllable minimum holding current circuit in communication with the received alternating current power signal, the controllable minimum holding current circuit responsive to an output of the detector, wherein in the event that the detector detects the absence of the phase cut dimmer, the controllable minimum holding current circuit is disabled such that a minimum holding current is not provided.

Abstract: A system includes first, second, and third sets of LEDs and a control module. The first set of LEDs outputs light having wavelengths in a wavelength range in a spectrum of ultraviolet light and is coated with a phosphor to convert the ultraviolet light to blue light having wavelengths in a wavelength range in a spectrum of blue light. The second and third sets of LEDs output light having wavelengths in a wavelength range in the spectrum of blue light and is coated with phosphors to convert the blue light to light having wavelengths in a wavelength range in a spectrum of green, yellow, and red light. The second set of LEDs generates less red light than green light. The third set of LEDs generates less green light than red light. The current control module controls currents through the first, second, and third sets of LEDs to generate white light.

Abstract: A circuit for altering a level of impedance presented to a power supply including a power supply line includes an energy dissipating circuit, a detection circuit configured to generate a control signal indicative of a power consumption level in a load circuit coupled to the power supply line, and an activation circuit configured to controllably couple the energy dissipating circuit to the power supply line in response to the control signal. Methods of operating a solid state lighting apparatus including a power supply and a solid state lighting device coupled to the power supply include detecting a level of power consumption by the solid state lighting device, and coupling an energy dissipating circuit to the power supply in response to the level of power consumption by the solid state lighting device falling below a threshold level.

Abstract: A medical lighting device has an operating area light (100), a central control station (11), a lighting control unit (7), a control unit (39), an image detection element (27), an image processing unit (29), reference elements (67, 69), an operating unit (200), a position sensor (25), an operating element (33) arranged at a handle (31), a marking and distance detection element (35) and a device for data transmission (13, 15, 17, 19, 21, 26, 28). A horizontal-vertical position (58) of the operating unit (200) in the room and a light marking position (38) on a reclining surface (99) are determined by the position sensor (25), the marking and distance detection element (35), the image detection element (27) combined with reference elements (67, 69) and image processing unit (29). The operating area light (100) is actuated such that an illuminated area (71) is illuminated on the reclining surface.

Abstract: A lamp comprising a solid state light emitter, the lamp being an A lamp and providing a wall plug efficiency of at least 90 lumens per watt. Also, a lamp comprising a solid state light emitter and a power supply, the emitter being mounted on a heat dissipation element, the dissipation element being spaced from the power supply. Also, a lamp, comprising a solid state light emitter and a heat dissipation element that has a heat dissipation chamber, whereby an ambient medium can enter the chamber, pass through the chamber, and exit. Also, a lamp, comprising a light emissive housing at least one solid state lighting emitter and a first heat dissipation element.

Abstract: An optical lighting apparatus having a constant luminance with a drive current controlled by a controller unit. A temperature controlled photodetector indirectly monitors the luminance and informs the controller when a change in luminance has occurred so that the controller can make appropriate adjustments to the drive current. Also disclosed is a method of regulating the drive current to a light source to enable the luminance to remain fixed and independent of fluctuations in ambient temperature. A temperature compensated photodetector senses the amount of light reflected off a diffuser lens and feeds back the output to a controller circuit which regulates the drive current to the light source. The lighting apparatus has application in calibrating imaging systems, such as digital cameras, and for scanning devices.

Abstract: A driver circuit for driving light emitting diodes (LEDs). The driver circuit includes a string of LEDs divided into n groups, the n groups of LEDs being electrically connected to each other in series, a downstream end of group m?1 being electrically connected to the upstream end of group m. The driver circuit also includes a power source coupled to an upstream end of group 1. The driver circuit further includes a plurality of current regulating circuits, where each current regulating circuit is coupled to the downstream end of a corresponding group at one end and coupled to a ground at another end and includes a sensor amplifier and a cascode having two transistors. The driver circuit also includes a phase control logic for sending a signal to each of the current regulating circuits to thereby control a current flow through each of the current regulating circuits.

Abstract: A wake-up system includes an illumination apparatus and an interface apparatus. A wake-up time is input to the interface apparatus. The illumination apparatus varies output and color temperature of wake-up light that it irradiates. The output of the irradiated wake-up light is increased from a wake-up operation start time to the wake-up time. Color temperature of the wake-up light is controlled to become higher in one period than in another period between the wake-up operation start time to the wake-up time.

Abstract: An LED assembly containing separately-controllable regions of LEDs with temperature sensing devices placed to measure the temperature within each region of LEDs. When the temperature difference between two regions becomes higher than an acceptable maximum, the system may adjust the power to one or more LED regions to maintain luminance uniformity. The regions can be arranged vertically or horizontally or both. A software processor may be used to interpret the data from the temperature sensing devices and control the power sent to the various LED regions. Embodiments can be used at least in LED backlights for LCD displays or for LED displays.

Abstract: Sensor devices (1) are provided with trigger signal generators (2) for repeatedly generating trigger signals and light detectors (12) for detecting light parameters such as intensities and colors and color temperatures and patterns and fluctuations of light (43) at a location and transmitters (9) for, in response to trigger signals, transmitting control signals based on detections to control devices (20) for controlling light sources (40) to influence the light (43) at the location. The sensor devices (1) may further comprise theme code generators (3), location code generators (4), processors (5), scanners (10), and position detectors (6).

Abstract: A RF generator includes a structure having an input section, an output section, and an opening extending between the input section and the output section, wherein the output section has a first cavity and a second cavity, and wherein the first and second cavities are spaced apart from each other so that they are electromagnetically uncoupled from each other. A method of providing RF energy, includes receiving an electron beam, providing a first RF energy through a first cavity, wherein the first RF energy is generated using the electron beam, and providing a second RF energy through a second cavity, wherein the second RF energy is generated using the electron beam, wherein the first cavity and the second cavity are spaced apart from each other so that they are electromagnetically uncoupled from each other.

Abstract: Provided is a power supply device, which is capable of coping with semiconductor light source loads to be set in various ways, and has high efficiency, in which a current to be supplied to each of the loads has a small ripple. The power supply device supplies power to a semiconductor light source load and lights the semiconductor light source load, and includes: a DC-DC converter; and a controller. The DC-DC converter includes an inductance element and a switching element, and performs voltage conversion by storing energy in the inductance element from an input power source when the switching element is on, and discharging the energy, the energy being stored in the inductance element, to a load side when the switching element is off. The controller controls ON/OFF operations of the switching element so that an output current of the DC-DC converter can be the same as a target value.

Abstract: Disclosed herein is a lighting apparatus which varies a light emission pattern of a light emitting unit based on external stimuli, such as sounds, and is aesthetically pleasing to a user through variation in light emission pattern. A lighting apparatus includes a housing having a plurality of light irradiation regions, a light emitting unit including a substrate disposed within the light irradiation regions in the housing and a plurality of light emitting diodes (LEDs) mounted on the substrate so as to correspond to the light irradiation regions, an electronic module to supply power to the light emitting unit, a sound sensing unit to sense a sound, and a controller to control at least one of ON/OFF, a light emission sequence, a light emission cycle, a quantity of light and a light emission time of the light emitting diodes based on a level of the sensed sound.

Abstract: Disclosed is a light bulb which utilizes LEDs which replaces an incandescent light bulb in a fixture for incandescent light bulbs. The LED light bulb includes a multi-faceted head on which multiple LEDs are placed, with the multi-faceted head being in contact with heat dissipation structures. The heat dissipation structures include a heat transfer column which extends from the LEDs to the base of the bulb. A removable cover is enclosed which has openings for air circulation within the globe of the light bulb.

Abstract: A synchrocyclotron includes magnetic structures that define a resonant cavity, a source to provide particles to the resonant cavity, a voltage source to provide radio frequency (RF) voltage to the resonant cavity, a phase detector to detect a difference in phase between the RF voltage and a resonant frequency of the resonant cavity that changes over time, and a control circuit, responsive to the difference in phase, to control the voltage source so that a frequency of the RF voltage substantially matches the resonant frequency of the resonant cavity.

Abstract: An embodiment of the disclosure relates to a voltage converter for supplying a semiconductor light source and having at least an input terminal connected to a power supply reference, namely an AC mains voltage reference, and an output terminal providing a current signal to said semiconductor light source, the converter being also connected to a voltage reference and comprising at least a step-down block inserted between a switching node and to the output terminal and connected to the voltage reference and an input block connected to the input terminal, as well as to a first input node and to a first output node of a control circuit, in turn connected to the switching node and to the voltage reference.

Abstract: In one general aspect, a dimmer power supply circuit is disclosed for use with single-pole dimmers that includes a first AC mains input line, second AC mains input line, and a rectification circuit responsive to the first and second AC mains input lines. A positive LED supply terminal responsive to the rectification circuit, and a negative LED supply terminal is responsive to the rectification circuit. At least one preload resistor is operatively connected in a first intermittent loading circuit path between two supply rails in the dimmer power supply circuit, and a peak detector is responsive to the first and second AC mains input lines.