Provided is an LED retrofit lamp interfacing with a high intensity discharge (HID) ballast that includes a lighting source having a plurality of light emitting diodes (LEDs), one or more heat sink components dissipating heat generated by the LEDs, and an LED driver configured to operate the LEDs. The LED retrofit lamp is disposed within an HID housing and the HID ballast is electrically connected with the LED driver, and supplies power to the LED driver for operating the LEDs.

A method of retrofitting a plurality of LED bulbs to a fluorescent tube fixture with a ballast, a fluorescent tube receptacle, a reflector housing and a lens comprises: removing the lens from the reflector housing; disconnecting the ballast from a mains power supply line and removing the ballast and the fluorescent tube receptacle from the housing. The mains mains power supply is wired to a plurality of Edison socket light-emitting diode (LED) bulb sockets extending from a body defining an electrical junction box and threading a plurality of LED bulbs into the bulb sockets. The electrical junction box is mounted to the reflector housing. The fixture lens is reinstalled to the housing such that the bulb adapter is received in an enclosure defined by the housing and the lens.

An LED tube lamp is disclosed. An installation detection circuit is configured in the LED tube lamp configured to receive an external driving signal. The installation detection circuit is configured to detect during one or more pulse signals whether the LED tube lamp is properly installed on a lamp socket, based on detecting a signal generated from the external driving signal. The installation detection circuit includes a switch circuit coupled to the pulse generating circuit, wherein the one or more pulse signals control turning on and off of the switch circuit. The installation detection circuit is further configured to: when it is detected during one or more pulse signals that the LED tube lamp is not properly installed on the lamp socket, control the switch circuit to remain in an off state to cause a power loop of the LED tube lamp to be open; and when it is detected during one or more pulse signals that the LED tube lamp is properly installed on the lamp socket, control the switch circuit to remain in a conducting state to cause the power loop of the LED tube lamp to maintain a conducting state.

An LED driving circuit, a light tube and an illumination device are provided. The LED driving circuit includes a first AC input end, a second AC input end, a driving module, a first protection unit, a first DC output end and a second DC output end. The first protection unit includes a voltage detection subunit and an abnormality cutoff subunit, and the voltage detection subunit is connected in parallel between two corresponding voltage nodes of the driving module, and the voltage detection subunit is configured to detect a voltage value of the driving module; and the abnormality cutoff subunit is connected in series between the second input end of the driving module and the second AC input end; the first protection unit is configured to cut off a circuit of the driving module when a voltage abnormality of the driving module is detected.

This disclosure relates to a LED driving circuit compatible with an electronic ballast and an electronic supply, and a LED lamp, which include a first input terminal receiving an alternating current, a second input terminal, a buck circuit connected with the first input terminal and the second input terminal, a rectifier circuit connected with the buck circuit, a leakage current limit circuit connected with the rectifier circuit, a constant current output circuit connected with the leakage current limit circuit, a signal sample circuit connected with the second input terminal and the leakage current limit circuit, and a switch connected with the leakage current limit circuit. When a high frequency voltage outputted by the connected electronic ballast is automatically depressed for protecting subsequent circuits, when connecting the electronic supply, it is satisfied with a single terminal and double terminals connecting a power, and the double terminals pass a leakage current test.

A lighting apparatus includes a first electrode, a second electrode, a lighting source, a rectifier, a driver and an electric shock prevention circuit. The first electrode and the second electrode receive an external power source. The external power source is either an alternating current or a direct current. The light source has multiple LED modules. The rectifier is used for rectifying the external power source to a rectified power. The driver is used for converting the rectified power to a driving current supplying to the light source.

An elongated heatsink structure retaining single and/or bi-directional light sources that receive variable power input(s) through at least one endcap coupled to the elongated heatsink structure.

A light emitting diode (LED) tube includes a translucent tubular body having an inner surface, an outer surface, a first end, and a second end. The LED tube further includes a first end cap with a first pair of contact pins, arranged at the first end of the tubular body, and a second end cap with a second pair of contact pins, arranged at the second end of the tubular body, an LED light engine with a plurality of LEDs, and a driver circuit for driving the LED light engine. The driver circuit includes a first sub-circuit with at least one electronic component and a second sub-circuit with at least one electronic component.

An LED lamp (1) for use in a luminaire (2), the LED lamp (1) comprising a plurality of LEDs (14) connected in a plurality of groups (15, 16); one or more rectifier circuits (10, 10a, 10b) adapted for rectifying an electrical current received from the luminaire (2) for supply to the LEDs (14); a first control circuit (24) adapted to estimate electrical current or electrical power received by or used by the LED lamp (1), and adapted to generate an output on the basis of the estimate; and a switching circuit (20) comprising a first switch (21) for switching the plurality of groups of LEDs (15, 16) between a plurality of different circuit configurations at a switching frequency of at least 300 kHz and according to a duty cycle; wherein the switching circuit (20) is configured to adjust the duty cycle in dependence on the output of the first control circuit (24) to adjust the electrical power used by the LED lamp (1).

A driving circuit is provided in this present disclosure, the driving circuit includes a voltage input module, a quick start module and a control module. The voltage input module includes a first input terminal and a second input terminal and is configured to receive an alternating current voltage and convert the alternating current voltage into a direct current voltage. The quick start module is coupled to the voltage input module and configured to receive the direct current voltage and convert the direct current voltage into a startup voltage. The control module is coupled to the quick start module and configured to receive the startup voltage and control a load, wherein the quick start module comprises a first resistor and a second resistor connected in series and is coupled between the first input terminal and the control module.