Led lamp

An LED lamp, comprising:

• an optical part comprising a hollow light penetrable tube and an LED module received in the light penetrable tube, the LED module being provided with at least one first LED and at least one second LED, the at least one first LED and the at least one second LED of the LED module cooperatively functioning as a main light source for normal illumination, the at least one second LED of the LED module functioning independently as an auxiliary light source for emergency illumination;
• a heat dissipation member received in the light penetrable tube, the LED module being thermally attached to the heat dissipation member;
• and
• an electric part comprising a circuit board, a rechargeable battery and two end covers, the circuit board and the rechargeable battery being arranged in the light penetrable tube, the two end covers being arranged at two opposite ends of the light penetrable tube, the circuit board forming an AC-to-DC power conversion circuit, a charging circuit and a switching controlling circuit thereon, wherein when an external AC power source is transferred to the AC-to-DC power conversion circuit, the AC-to-DC power conversion circuit converts the AC power source to DC power source and provides a first DC power source at a first output end thereof and a second DC power source at a second output end thereof, the charging circuit being electrically connected to the first output end of the AC-to-DC power conversion circuit to receive the first DC power source, the rechargeable battery being electrically connected to the charging circuit, the auxiliary light source being electrically connected to the rechargeable battery through the switching controlling circuit, the main light source being electrically connected to the second output end of the AC-to-DC power conversion circuit to receive the second DC power source and adapted for providing normal illumination when the external AC power source is supplied normally, the auxiliary light source being adapted for providing emergency illumination when the external AC power source is interrupted, wherein when the external AC power source is supplied normally the switching controlling circuit electrically disconnects the rechargeable battery and the auxiliary light source and wherein when the external AC power source is interrupted the switching controlling circuit electrically interconnects the rechargeable battery and the auxiliary light source.