Abstract: A retrofit light emitting diode (LED) lamp is provided for replacement of ballast driven fluorescent lamps. The retrofit LED lamp comprises a plurality of light emitting diodes. The plurality of light emitting diodes is mounted on a metal core printed circuit board (MCPCB). A PCB circuit is provided for driving the plurality of LEDs that further comprises a bridge rectifier made of a schottky diode.

Abstract: A strike barrier for use in an LED retrofit lamp is provided. The present invention provides the strike barrier with two silicon controlled rectifiers (SCRs) whose input is connected to a bridge rectifier and output is connected to a string of LED through a Zener diode. The strike barrier is compatible with UL ANSI requirement for a normal mode and an abnormal mode.

Abstract: A strike barrier for use in an LED retrofit lamp is provided. The present invention provides the strike barrier with two silicon controlled rectifiers (SCRs) whose input is connected to a bridge rectifier and output is connected to a string of LED through a Zener diode. The strike barrier is compatible with UL ANSI requirement for a normal mode and an abnormal mode.

Abstract: A retrofit light emitting diode (LED) lamp is provided for replacement of ballast driven fluorescent lamps. The retrofit LED lamp comprises a plurality of light emitting diodes. The plurality of light emitting diodes is mounted on a metal core printed circuit board (MCPCB). A PCB circuit is provided for driving the plurality of LEDs that further comprises a bridge rectifier made of a schottky diode.

Abstract: A LED retrofit lamp for replacement of fluorescent lamp or tube driven by fluorescent ballast is provided. The retrofit lamp is compatible with the fluorescent ballast that requires the presence of a barrier for striking an arc voltage. The present invention provides a strike barrier—a controllable barrier that does not allow current conduction until a threshold voltage is reached. When a current above the threshold voltage passes through the strike barrier, the circuit latches and allows conduction at normal voltage. The present invention also provides a circuit that replicates the cathode heater resistance of a fluorescent lamp to rapid start and programmed start ballast.

Abstract: A retrofit LED lighting system with a combination of a directional downlight component and an indirect uplight component is provided. The system comprises light emitting diodes arranged so as to replicate the function of a legacy light source in a transparent or translucent fixture housing. The LED lamp includes upwards facing LEDs emitting light upwards, and a translucent stem covering the uplight LEDs to allow the light from the LEDs to pass through it. Advantageously, the LED lamp with uplight component and a transparent/translucent stem allows the light to be directed upwards and hence, avoids having a sharp cut-off of light appearing in the middle of the reflector fixture and also avoids a lack of uplight shone on the ceiling.

Abstract: A strike barrier for use in an LED retrofit lamp is provided. The present invention provides the strike barrier with two silicon controlled rectifiers (SCRs) whose input is connected to a bridge rectifier and output is connected to a string of LED through a Zener diode. The strike barrier is compatible with UL ANSI requirement for a normal mode and an abnormal mode.