Abstract: An LED lamp is configured to be connected to a leakage protection switch. The LED lamp includes one or more light emitting diodes, a control circuit, a light board and an enclosure. The control circuit is configured to be coupled to the leakage protection switch by a hot connector and a neutral connector. The light board is a printed circuit board that includes a track that surrounds a light module. A branch of the hot connector is directly coupled to the track and the light module is coupled to the control circuit by a hot line and a neutral line. The enclosure supports the control circuit and the light board. When water contacts the track, at least a portion of a current flowing through the hot connector enters a ground conductor, thereby causing the leakage protection switch to electrically disconnect the LED lamp from a power supply.

Abstract: A lens and strobe light system are provided. The lens can include a base defining a cavity configured to accept one or more light sources. The lens can further include one or more lens segments disposed on the base. The one or more lens segments can be configured to direct light emitted from the one or more light sources out from the lens. The strobe light system can include a plurality of light sources, a plurality of lenses disposed on the plurality of light sources, and a controller configured to control the operation of the plurality of light sources. The plurality of lenses can be configured to direct light emitted from the plurality of light sources out from the strobe light system.

Abstract: Troffer lighting systems can include a lighting panel having one or more light sources and one or more wing portions coupled to the lighting panel. The wing portions can be configured as reflectors to reflect light emitted by the one or more light sources. The wing portions (or reflectors) can be rotatably and/or hingedly coupled to the lighting panel. The coupled wing portions can be movable between a closed and opened position relative to the lighting panel. The closed position reduces the overall size of the troffer lighting system compared to the opened position, and the system is operable while in the opened position. Method of installing a troffer lighting systems is also included.

Abstract: Troffer lighting systems can include a lighting panel having one or more light sources and one or more wing portions coupled to the lighting panel. The wing portions can be configured as reflectors to reflect light emitted by the one or more light sources. The wing portions (or reflectors) can be rotatably and/or hingedly coupled to the lighting panel. The coupled wing portions can be movable between a closed and opened position relative to the lighting panel. The closed position reduces the overall size of the troffer lighting system compared to the opened position, and the system is operable while in the opened position. Method of installing a troffer lighting systems is also included.

Abstract: Troffer lighting systems can include a lighting panel having one or more light sources and one or more wing portions coupled to the lighting panel. The wing portions can be configured as reflectors to reflect light emitted by the one or more light sources. The wing portions (or reflectors) can be rotatably and/or hingedly coupled to the lighting panel. The coupled wing portions can be movable between a closed and opened position relative to the lighting panel. The closed position reduces the overall size of the troffer lighting system compared to the opened position, and the system is operable while in the opened position. Method of installing a troffer lighting systems is also included.

Abstract: A lens and strobe light system are provided. The lens can include a base defining a cavity configured to accept one or more light sources. The lens can further include one or more lens segments disposed on the base. The one or more lens segments can be configured to direct light emitted from the one or more light sources out from the lens. The strobe light system can include a plurality of light sources, a plurality of lenses disposed on the plurality of light sources, and a controller configured to control the operation of the plurality of light sources. The plurality of lenses can be configured to direct light emitted from the plurality of light sources out from the strobe light system.

Abstract: Multiple LEDs connected in series are driven by DC voltage that is provided by a diode rectifier connected to a three-phase power source. In order to reduce ripple in the DC voltage, the series-connected LEDs can be divided into a first set and a second set, and a first constant current source is provided that drives the first set, and a second constant current source is provided that drives the second set. The first and second constant current sources are both connected across the outputs of the rectifier circuit, and operate to drive the respective sets of light emitting diodes in alternation. The capability for dimming can be provided, as well as back-up single phase operation. The light emitting diodes can be situated remote from said rectifier and connected thereto by a single phase power transmission system, formed by only two wires.

Abstract: Multiple LEDs connected in series are driven by DC voltage that is provided by a diode rectifier, the diode rectifier being connected to a three-phase power source and converting the three-phase currents from the three-phase power source into the DC voltage that is used to drive the light emitting diodes. In order to reduce ripple in the DC voltage, the series-connected light emitting diodes can be divided into a first set and a second set, and a first constant current source is provided that drives the first set, and a second constant current source is provided that drives the second set. The first and second constant current sources are both connected across the outputs of the rectifier circuit, and operate to drive the respective sets of light emitting diodes in alternation. The capability for dimming can be provided, as well as back-up single phase operation.

Abstract: An LED array switching apparatus comprises, on a single PCB substrate: a plurality of LED arrays D1 to Dn connected in series, each LED array having a forward voltage; an AC voltage supply coupled to the plurality of LED arrays; and a plurality of constant current sources G1 to Gn, coupled to outputs of LED arrays D1 to Dn, respectively, each of the constant current sources being switchable between a current regulating state and an open state such that as the voltage of the AC voltage supply increases, LED arrays are switched on and lit to form a higher forward voltage LED string, and as the voltage of the AC voltage supply decreases, LED arrays are switched off and removed from the LED string starting with the most recently lit LED array.

Abstract: A lighting apparatus using at least one light-emitting diode (“LED”), back-reflecting collection optics for LEDs, and an improved heat sink mounting apparatus which promotes efficient heat dissipation generated from the LED while minimizing light obstruction and glare. The lighting apparatus contains a main housing; a reflector disposed within the main housing, the reflector having a front side and a rear side; a top rim thermally coupled to one end of the main housing; a heat conducting body positioned to face the front side of the reflector, the heat conducting body comprising a heat pipe thermally coupled to the top rim; at least one light-emitting diode thermally coupled to the heat conducting body, the at least one light-emitting diode being positioned to face directly at the front side of the reflector so that light emitted from the at least one light-emitting diode is directed to the front side of the reflector.

Abstract: Multiple LEDs connected in series are driven by DC voltage that is provided by a diode rectifier connected to a three-phase power source. In order to reduce ripple in the DC voltage, the series-connected LEDs can be divided into a first set and a second set, and a first constant current source is provided that drives the first set, and a second constant current source is provided that drives the second set. The first and second constant current sources are both connected across the outputs of the rectifier circuit, and operate to drive the respective sets of light emitting diodes in alternation. The capability for dimming can be provided, as well as back-up single phase operation. The light emitting diodes can be situated remote from said rectifier and connected thereto by a single phase power transmission system, formed by only two wires.

Abstract: An LED array switching apparatus, comprises: a plurality of LED segments D1 to Dn connected in series, each LED segment having a forward voltage; a voltage supply coupled to the plurality of LED segments; and a plurality of constant current sources G1 to Gn, coupled to outputs of LED segments D1 to Dn, respectively. Each of the constant current sources is switchable between a current regulating state and an open state such that as the voltage of the voltage supply increases, LED segments are switched on and lit to form a higher forward voltage LED string, and as the voltage of the voltage supply decreases, segments are switched off and removed from the LED string starting with the most recently lit segment.

Abstract: In a solid-state lighting apparatus, a lamp body is provided with a solid-state light module and a detachable module space in the lamp body. A detachable module is provided exterior to the lamp body prior to insertion and which is insertable into the detachable module space and has contacts engageable with corresponding contacts in the module space. The detachable module has an internal circuit for controlling the solid-state light module.

Abstract: Multiple LEDs connected in series are driven by DC voltage that is provided by a diode rectifier, the diode rectifier being connected to a three-phase power source and converting the three-phase currents from the three-phase power source into the DC voltage that is used to drive the light emitting diodes. In order to reduce ripple in the DC voltage, the series-connected light emitting diodes can be divided into a first set and a second set, and a first constant current source is provided that drives the first set, and a second constant current source is provided that drives the second set. The first and second constant current sources are both connected across the outputs of the rectifier circuit, and operate to drive the respective sets of light emitting diodes in alternation. The capability for dimming can be provided, as well as back-up single phase operation.

Abstract: An LED array switching apparatus comprises, on a single PCB substrate: a plurality of LED arrays D1 to Dn connected in series, each LED array having a forward voltage; an AC voltage supply coupled to the plurality of LED arrays; and a plurality of constant current sources G1 to Gn, coupled to outputs of LED arrays D1 to Dn, respectively, each of the constant current sources being switchable between a current regulating state and an open state such that as the voltage of the AC voltage supply increases, LED arrays are switched on and lit to form a higher forward voltage LED string, and as the voltage of the AC voltage supply decreases, LED arrays are switched off and removed from the LED string starting with the most recently lit LED array.

Abstract: A lighting apparatus contains a main housing; a reflector disposed within the main housing, and having a front side and a rear side; a heat conducting body comprising at least two heat pipes, wherein a first portion of the at least two heat pipes are parallel to a central axis of the lighting apparatus on the front side of the reflector, and a second portion of each of the at least two heat pipes is in the rear side of the reflector and is thermally coupled to the main housing; a heat conducting head located on the front side of the reflector, and is thermally coupled to the heat conducting body; at least two light-emitting diodes (“LEDs”) thermally coupled to the heat conducting body, and being positioned to face the front side of the reflector so that light emitted from the LEDs are directed to said front side.

Abstract: A lighting apparatus having an axial heat pipe, will a light source, e.g., light-emitting diodes (“LEDs”), mounted on a proximate end of the axial heat pipe so as to face a reflector, the heat pipe passing through the reflector, and the distal end of the heat pipe on the other side of the reflector having a heat sink for dissipating the heat generated by the LEDs, with the heat sink having multiple heat dissipating fins.

Abstract: A lens for an LED street lamp has an external curved surface that has a concave surface portion on one side thereof. A back surface of the lens has a micro-prism array and retainer feet. A recess in the back surface receives an LED light source. The outer surface of the lens has facets or windows that provide overlapping projections of light from adjacent facets. The lens is generally cushion shaped with an indentation at one side. The lens directs light in an asymmetrical distribution transverse to the lens and to direct light symmetrically over a wide area in a longitudinal direction of the lens.

Abstract: A device and method for reducing current ripple to a light emitting diode array having a single stage power factor correction driver with an output voltage ripple that is reduced by using a linear current regulator connected in series between the single stage power factor correction driver and the light emitting diode array, which actively adjusts an equivalent impedance of the linear current regulator in correspondence with the output voltage ripple of the single stage power factor correction driver.

Abstract: An LED lighting circuit where the configuration of the connection of two or more LEDs are changed from parallel to series through the use of solid state switches depending on whether the voltage level from an AC source measured by a voltage detector exceeds the sum of the forward voltages of the LEDs. Also, a method of activating LEDs in an LED array lighting apparatus involving applying a rectified alternating current to two or more LEDs, each LED having a forward bias voltage; comparing the rectified alternating current to the sum of the forward bias voltages of the two or more LEDs; and changing the circuit configuration of the two or more LEDs between a parallel connection and a series connection with respect to the rectified alternating current depending on whether the rectified alternating current exceeds the sum of the forward bias voltages of the two or more LEDs.