Patent ID: 8622571

Claim:
A LED tube, comprising a substantially fluorescent-tube-shaped and fluorescent-tube-sized translucent or fluorescent tube having at least one LED component and a current control unit installed therein, both ends of the LED tube being provided with two contact pins for connecting the LED tube mechanically and electrically to tube holders of a fluorescent tube lighting fixture, at both ends of the LED tube, a resistive, inductive and/or capacitive measuring component is connected between these two contact pins to form a current path between the contact pins, wherein the LED tube includes a safety unit arranged to prevent a voltage from passing through the LED tube from its one end to the other end thereof until at both ends of the LED tube, a voltage fed from the corresponding tube holder of the lighting fixture to said two contact pins has been detected separately, the safety unit being arranged to detect a low voltage across the measuring component at both ends of the LED tube, the low voltage resulting from a current passing through the measuring component and being generated in the ballast-starter circuit in the fluorescent tube lighting fixture by a high-resistance component connected in place of or in parallel with a starter.