Abstract:
A regulator scheme for an LED light wherein the peak input current to the regulator and the regulator duty cycle produce a feedback signal which infers the average regulator output current. Both buck-boost and flyback type output circuits are disclosed.
Abstract:
A fluorescent light tube retrofit with light emitting diodes (LEDs) that evenly distribute light to avoid bright spots is disclosed. One tube in the form of a conventional fluorescent tube includes two LEDs mounted to the tube on opposite sides of a single circumference of the tube. The LEDs can face the center of the tube, or the LEDs can be offset facing relative to the center of the tube. A reflecting surface can be disposed inside the tube to reflect light evenly toward an arc of the tube. Alternatively, at least one LED can be oriented to direct light into a light pipe that curves around the interior of the tube.
Abstract:
Disclosed herein is an illumination device including light-emitting diodes, an alternating current input, a full-wave rectifier coupled to the alternating current input and configured to produce a rectified voltage output and a power converter, the power converter having a switching element electrically coupled to the rectified voltage output of the full-wave rectifier. An improvement of the illumination device includes a feedback circuit configured to determine an average current across the light-emitting diodes and to invert a signal representing the average current to provide a switching signal to the switching element such that, for a range of operating points, increasing a current drawn into the power converter will decrease LED power and decreasing the current drawn into the power converter will increase LED power.
Abstract:
Disclosed herein is a replacement light for a fluorescent tube usable in a fluorescent fixture connected to a power source and containing at least one LED, the improvement including a detection circuit for connection to the power source, the detection circuit configured to identify the power source.
Abstract:
An LED-based light can include a highly thermally conductive base having multiple radially outward projecting nodes. The nodes can be spaced apart in an axial and circumferential directions of the base. An electrical connector and at least one LED can be attached to the base, and a light transmitting bulb can be attached to the base and can cover the at least one LED. The geometry of the base can promote heat dissipation, which can allow the at least one LED to use enough power to produce an amount of luminosity that allows the LED-based light to replicate, for example, an incandescent light without overheating.
Abstract:
A light modifier for an LED producing light about a central axis is provided. The light modifier includes a lens defining an indentation. The indentation is angled relative to the central axis by an amount less than a complementary angle of a critical angle of the lens along the indentation. The lens can reduce the appearance of a bright spot created by the LED.
Abstract:
Disclosed herein are embodiments of LED-based lights for replacing a conventional fluorescent light bulb in a fluorescent light fixture and embodiments of a circuit board mount for an LED-based light tube having an elongate housing with at least one circuit board spanning the housing. One embodiment disclosed herein of a circuit board mount comprises an end cap configured to fit over an open end of the housing. The end cap comprises an end wall, at least one pin connector extending through the end wall and at least one fitted slot extending from the end wall configured to receive an end of the circuit board, the at least one fitted slot having an elastic member within the at least one fitted slot configured to cushion the circuit board.
Abstract:
An LED based light comprises a base, a light structure, a heat dissipating structure, and at least one LED. The light structure is adjacent to the base and extends along a longitudinal axis of the light. The light structure includes an inner surface and an outer surface and defines a cavity, and the heat dissipating structure extends into the cavity. At least one LED is mounted in thermally conductive relation to the heat dissipating structure. In one version, the light structure is an annular flange, and an organic LED is mounted to the outer surface. In another version, the light structure is a light pipe configured to distribute a light produced by the at least one LED in a predetermined light distribution.
Abstract:
An LED based light and a method of providing power to the LED are disclosed. The LED based light includes at least one LED and at least one thermoelectric generator having a first side and a second side. The first side is thermally coupled to the at least one LED such that heat generated by the at least one LED is conducted to the at least one thermoelectric generator, producing a temperature differential between the first side and second side. The at least one thermoelectric generator is configured to produce electrical energy from the temperature differential.
Abstract:
Disclosed herein are embodiments of LED-based lights for use in fluorescent fixtures that emanate light in a plurality of directions. One embodiment disclosed herein of an LED light for use in a fluorescent light fixture comprises a housing and a circuit board having a first surface configured to face an illumination area, the circuit board mounted in the housing and defining a plane conceptually dividing the housing into a first portion and a second portion. At least one LED is mounted on the first surface of the circuit board and is configured to emanate light in a first direction. Light distribution means is configured to distribute a portion of the light emanated in the first direction to at least a second direction different than the first direction.