Abstract: A method and circuit to use light-emitting diodes to emulate the dimming performance of incandescent lighting, and more particularly, to making a circuit that uses only white and deep red light-emitting diodes to achieve a coordinated-color-temperature as a function of dim level that is close to that of an incandescent light being similarly dimmed.

Abstract: A method and circuit to use light-emitting diodes to emulate the dimming performance of incandescent lighting, and more particularly, to making a circuit that uses only white and deep red light-emitting diodes to achieve a coordinated-color-temperature as a function of dim level that is close to that of an incandescent light being similarly dimmed.

Abstract: A method and circuit to use light-emitting diodes to emulate the dimming performance of incandescent lighting, and more particularly, to making a circuit that uses only white and deep red light-emitting diodes to achieve a coordinated-color-temperature as a function of dim level that is close to that of an incandescent light being similarly dimmed.

Abstract: A method and circuit to use light-emitting diodes to emulate the dimming performance of incandescent lighting, and more particularly, to making a circuit that uses only white and deep red light-emitting diodes to achieve a coordinated-color-temperature as a function of dim level that is close to that of an incandescent light being similarly dimmed.

Abstract: A universal AC-line input light emitting diode (LED) drive that automatically transitions to the most favorable configuration of the LEDs based on the particular range of line voltage input applied.

Abstract: In some embodiments, an apparatus comprising a rectifier that is configured to rectify an Alternating Current (AC) from an AC line to produce a rectified line voltage, at least one resistor operatively coupled to the rectifier, and at least one capacitor operatively coupled to the at least one resistor and ground is disclosed. In some instances, the at least one resistor and the at least one capacitor form a low-pass filter configured to reduce a ripple voltage of the rectified line voltage of the rectifier. In some instances, the at least one resistor and the at least one capacitor are configured to provide a minimum voltage on the at least one capacitor that is high enough to maintain at least one LED conducting current at a minimum level and maintain the at least one LED operational for substantially all of a line cycle of the AC line when the at least one LED is operatively coupled to the at least one capacitor.

Abstract: A universal AC-line input light emitting diode (LED) drive includes a rectifier, at least one LED connected to one output of the rectifier, a controllable element in series with the at least one LED, and a circuit for turning off the controllable element when the line voltage exceeds a reference voltage. The reference voltage is selected to produce the average current through the LEDs when the line voltage is nominally 120VAC, 240VAC, or 277VAC. Another circuit may also be provided for switching the reference voltage between at least two levels (e.g., two of 120VAC, 240VAC, or 277VAC) when an average line voltage exceeds a certain level.

Abstract: A high utilization AC-line input light emitting diode driver that can automatically transition to the most favorable configuration of the LEDs based on the instantaneous line voltage input.

Abstract: An LED light bulb which turns itself permanently off when it reaches the end of its useful life, and more particularly, to a scheme which slightly varies the end-of-life condition from unit to unit.

Abstract: A circuit for driving multiple light emitting diodes (LEDs) includes at least two sets of LEDs, each set comprised of one or more LEDs in series. The circuit further includes a single inductor connected in series with the two sets of LEDs. At least one set of LEDs is connected to a shunting transistor connected in parallel with the set of LEDs. The duty cycle of the shunting transistor is controlled by a single controller connected to the shunting transistor and the inductor.

Abstract: A light-emitting diode (LED) bulb has an LED within a shell. The LED bulb includes a driver circuit for providing current to the LED. The drive circuit has a thermal protection circuit, which includes a first positive thermal coefficient thermistor with a first switching temperature connected in series with a second positive thermal coefficient thermistor with a second switching temperature. The driver circuit includes a switch-mode power supply (SMPS) controller with an input pin and an output pin. The thermistors are connected to the input pin. When either thermistor temperature is above the respective switching temperatures, the thermal protection circuit causes the SMPS controller to produce a signal with a second duty cycle on the output pin. When both thermistor temperatures are below the respective switching temperatures, the thermal protection circuit causes the SMPS controller to produce a signal with a first duty cycle on the output pin.

Abstract: A constant power drive for light emitting diodes, such that there is automatic compensation for variation in forward voltage of the LED, both in a single unit with temperature, and also due to unit-to-unit variations.

Abstract: A glass LED bulb, which includes a body of glass, the body having at least one hollow portion, and at least one LED contained within the at least one hollow portion. A thermally conductive material is preferably included within the at least one hollow portion. The body of glass can be bulb-shaped or alternatively shaped like an incandescent bulb.

Abstract: A lighting circuit for a light emitting diode (LED) bulb capable of operating at different light output levels depending on received AC power includes a first group of LEDs and second group of LEDs, each of which is configured to emit light as a group. The lighting circuit also includes an AC/DC converter electrically connected to the first and second groups of LEDs. A detector circuit detects received AC power. A selection circuit is operable to cause the AC/DC converter circuit to provide current into one configuration of LEDs from the group of configurations of LEDs consisting of: the first group of LEDs only, the second group of LEDs only, and the first and second group of LEDs. The configuration of LEDs to provide current to is selected based on received AC power.

Abstract: An LED bulb having bulb-shaped shell and thermally conductive fluid or gel within the shell. The bulb includes at least one LED within the shell. The bulb includes at least one LED within the shell and a base. The base can be configured to fit within an electrical socket and can include a series of screw threads and a base pin, wherein the screw threads and base pin are dimensioned to be received within a standard electrical socket. Alternatively, the base can be configured to fit within a suitable electric socket.

Abstract: A lighting circuit for a light emitting diode (LED) bulb capable of operating at different light output levels depending on received AC power includes a first group of LEDs and second group of LEDs, each of which is configured to emit light as a group. The lighting circuit also includes an AC/DC converter electrically connected to the first and second groups of LEDs. A detector circuit detects received AC power. A selection circuit is operable to cause the AC/DC converter circuit to provide current into one configuration of LEDs from the group of configurations of LEDs consisting of: the first group of LEDs only, the second group of LEDs only, and the first and second group of LEDs. The configuration of LEDs to provide current to is selected based on received AC power.

Abstract: An LED bulb having a bulb-shaped shell, a thermally conductive plastic material within the bulb-shaped shell, and at least one LED within the bulb-shaped shell. The bulb also includes a base, wherein the base is dimensioned to be received within a standard electrical socket.

Abstract: An LED bulb, which includes a shell, a filler material within the shell of the bulb, at least one type of phosphor dispersed inside the filler material and at least one LED within the shell.

Abstract: A light bulb having anti-reflective coatings on an inner surface and/or an outer surface of the shell of the light bulb. The anti-reflective coatings reduce light loss due to reflections at the interfaces between the interior of the bulb and the shell and between the shell and the exterior of the bulb. The light source may be either incandescent, fluorescent or LED.

Abstract: A light emitting diode (LED) bulb configured to scatter certain wavelengths of light. The LED bulb includes a base having threads, a bulb shell, at least one LED, and a plurality of particles disposed within the bulb shell. The plurality of particles has a first and second set of particles. The first set of particles is configured to scatter short wavelength components of light emitted from the at least one LED and has particles with an effective diameter that is a fraction of the dominant wavelength of the light emitted from the at least one LED. The second set of particles is configured to scatter light emitted from the at least one LED, and has particles with an effective diameter equal to or greater than the dominant wavelength of the light emitted from the at least one LED.