A light emitting diode (LED) tube lamp configured to receive an external driving signal includes an LED module for emitting light, the LED module comprising an LED unit comprising an LED; a rectifying circuit for rectifying the external driving signal to produce a rectified signal, the rectifying circuit having a first output terminal and a second output terminal for outputting the rectified signal; a filtering circuit connected to the LED module, and configured to provide a filtered signal for the LED unit; and a protection circuit for providing protection for the LED tube lamp. The protection circuit includes a voltage divider comprising two elements connected in series between the first and second output terminals of the rectifying circuit, for producing a signal at a connection node between the two elements; and a control circuit coupled to the connection node between the two elements, for receiving, and detecting a state of, the signal at the connection node. The control circuit includes or is coupled to a switching circuit coupled to the rectifying circuit, and the switching circuit is configured to be triggered on or off by the detected state, upon the external driving signal being input to the LED tube lamp, to allow discontinuous current to flow through the LED unit.

An LED tube lamp includes a tube having two ends, two end caps respectively at the two ends of the tube, a power supply module in one or both of the end caps, an LED light strip in the tube; and LED light sources on the LED light strip. Each of the end caps includes a lateral wall substantially coaxial with the tube and an end wall substantially perpendicular to an axial direction of the lateral wall. An axial direction of one or more openings of each of the end caps is substantially parallel with the axial direction of the lateral wall. The LED light sources are electrically connected to the power supply module via the LED light strip. The power supply module includes a fuse, and the fuse is positioned close to the end wall of the first end cap.

An LED tube lamp includes a tube having two ends, two end caps respectively at the two ends of the tube, a power supply module in one or both of the end caps, an LED light strip in the tube; and LED light sources on the LED light strip. Each of the end caps includes a lateral wall substantially coaxial with the tube and an end wall substantially perpendicular to an axial direction of the lateral wall. An axial direction of one or more openings of each of the end caps is substantially parallel with the axial direction of the lateral wall. The LED light sources are electrically connected to the power supply module via the LED light strip. The power supply module includes a fuse, and the fuse is positioned close to the end wall of the first end cap.

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 lamp comprises an input for connection to a high frequency ballast for gas discharge lamps. A power supply unit obtains power from a LED on voltage of the LED of the lamp, and the power supply unit powers an isolation switch at the input. During a preheat stage of the ballast, the power supply unit does not close the isolation switch, but the isolation switch is closed when the high frequency ballast is in a later state, i.e. the ignition phase.

A lamp comprises an input for connection to a high frequency ballast for gas discharge lamps. A power supply unit obtains power from a LED on voltage of the LED of the lamp, and the power supply unit powers an isolation switch at the input. During a preheat stage of the ballast, the power supply unit does not close the isolation switch, but the isolation switch is closed when the high frequency ballast is in a later state, i.e. the ignition phase.

Realizing a constant-current control even in a stable state of a lamp without increasing a rated output of a power supply. In a stable state of the lamp in which a change value of a lamp voltage after a discharge lamp is turned on becomes less than a certain value, when the lamp voltage rises, a discharge lamp lighting control apparatus changes a current command value to perform a constant-current control. This change is a change from a first current command value at the time when the discharge lamp is turned on to a second current command value that is smaller than the former by a predetermined value. Using this second current command value, the constant-current control is performed. Even after that, the second current command value is changed to a smaller value every time the lamp voltage rises, and the constant-current control is performed using the second current command value.

Circuitry 31 for a solid-state lighting arrangement 20 designed for as a replacement for a gas discharge lamp used in a lighting fixture having a ballast. The circuitry 31 unsafe flow of current through the solid-state lighting arrangement 20, under non-operational conditions and during installation of the lighting arrangement, so as to provide compatibility with safety standards for use with discharge lamps.

Circuitry 31 for a solid-state lighting arrangement 20 designed for as a replacement for a gas discharge lamp used in a lighting fixture having a ballast. The circuitry 31 unsafe flow of current through the solid-state lighting arrangement 20, under non-operational conditions and during installation of the lighting arrangement, so as to provide compatibility with safety standards for use with discharge lamps.

A lamp including a light source including at least one string of light emitting diodes (LEDs) within a tube body; end caps having contacts on each end of the tube body; driver electronics within the tube body including a filament detector portion provided by a passive resistance capacitor (RC) circuit that simulates the filament load of a fluorescent lamp when installed into a ballast containing fixture: and a power level selector switch in communication with the driver electronics for selecting the power level for powering the light source.