Abstract: An LED lamp arrangement adapted for fitting in a luminaire. The luminaire is adapted for a fluorescent lamp and having a ballast. The LED lamp arrangement has a plurality of LEDs, and two or more electrodes for releasably connecting to the luminaire and for conducting current from the ballast for supply to the LEDs. The LED lamp arrangement further has a sensor circuit and a protection circuit. The sensor circuit and the protection circuit are adapted to increase the total load impedance of the LED lamp arrangement if the ballast is a constant power electronic ballast.

Abstract: An LED lamp arrangement for replacing a fluorescent lamp in a luminaire having a ballast. The LED lamp arrangement has at least a first group of LEDs and a second group of LEDs, a first circuit adapted to generate an output indicating whether the ballast is a magnetic ballast or a non-magnetic ballast, and a second circuit adapted to change a connection of the first and second groups of LEDs on the basis of the output of the first circuit. The second circuit is adapted to connect the first and second groups of LEDs in series, if the output from the first circuit indicates the ballast is a magnetic ballast, and to connect the first and second groups of LEDs in parallel, if the output from the first circuit indicates the ballast is a non-magnetic ballast.

Abstract: An LED lamp arrangement adapted for fitting in a luminaire. The luminaire is adapted for a fluorescent lamp and having a ballast. The LED lamp arrangement has a plurality of LEDs, and two or more electrodes for releasably connecting to the luminaire and for conducting current from the ballast for supply to the LEDs The LED lamp arrangement further has a sensor circuit and a protection circuit. The sensor circuit and the protection circuit are adapted to increase the total load impedance of the LED lamp arrangement if the ballast is a constant power electronic ballast.

Abstract: An LED lamp arrangement (1) adapted for fitting in a luminaire. The luminaire is adapted for a fluorescent lamp and having a ballast. The LED lamp arrangement has a plurality of LEDs (25, 26, 27) and two or more electrodes (22) for releasably connecting to the luminaire and for conducting current from the ballast for supply to the LEDs. The LED lamp arrangement further has a sensor circuit (21) and a protection circuit (24). The sensor circuit and the protection circuit are adapted to increase the total load impedance of the LED lamp arrangement if the ballast is a constant power electronic ballast.

Abstract: An LED lamp arrangement (1) adapted for fitting in a luminaire. The luminaire is adapted for a fluorescent lamp and having a ballast. The LED lamp arrangement has a plurality of LEDs (25, 26, 27) and two or more electrodes (22) for releasably connecting to the luminaire and for conducting current from the ballast for supply to the LEDs. The LED lamp arrangement further has a sensor circuit (21) and a protection circuit (24). The sensor circuit and the protection circuit are adapted to increase the total load impedance of the LED lamp arrangement if the ballast is a constant power electronic ballast.

Abstract: An LED lamp arrangement for replacing a fluorescent lamp in a luminaire having a ballast. The LED lamp arrangement has at least a first group of LEDs and a second group of LEDs, a first circuit adapted to generate an output indicating whether the ballast is a magnetic ballast or a non-magnetic ballast, and a second circuit adapted to change a connection of the first and second groups of LEDs on the basis of the output of the first circuit. The second circuit is adapted to connect the first and second groups of LEDs in series, if the output from the first circuit indicates the ballast is a magnetic ballast, and to connect the first and second groups of LEDs in parallel, if the output from the first circuit indicates the ballast is a non-magnetic ballast.

Abstract: An LED lamp arrangement adapted to replace a fluorescent lamp in a luminaire having a ballast for supplying power to the lamp. The LED lamp arrangement has LEDs arranged in groups. The groups of LEDs are connectable in plural circuit configurations, including at least a first circuit configuration, and a second circuit configuration having a different circuit arrangement of the groups of LEDs in which at least a portion of the groups of LEDs are connected into the circuit differently than in the first circuit configuration. The LED lamp arrangement further has a first circuit adapted to generate an output indicating whether the ballast is a magnetic ballast or a non-magnetic ballast, and a second circuit adapted to change a connection of the groups of LEDs between the first circuit configuration and the second circuit configuration on the basis of the output of the first circuit.

Abstract: An LED lamp arrangement adapted to replace a fluorescent lamp in a luminaire having a ballast for supplying power to the lamp. The LED lamp arrangement comprises a plurality of LEDs arranged in a plurality of groups, wherein the groups of LEDs are connectable in a plurality of circuit configurations, including at least a first circuit configuration, and a second circuit configuration having a different circuit arrangement of the groups of LEDs in which at least a portion of the groups of LEDs are connected into the circuit differently than in the first circuit configuration. The LED lamp arrangement further comprises a first circuit adapted to generate an output indicating whether the ballast is a magnetic ballast or a non-magnetic ballast, and a second circuit adapted to change a connection of the plurality of groups of LEDs between the first circuit configuration and the second circuit configuration on the basis of the output of the first circuit.