Led lamp

An LED lamp comprising:

• a bulb;
• an LED module comprising a plurality of LEDs received in the bulb;
• a heat dissipation apparatus supporting and cooling the LED module, the heat dissipation device comprising:
• a heat sink having a hollow base and a plurality of fins mounted on the base;
• a hollow first heat conductor supported by the heat sink;
• and
• a heat transfer device having a container defining a vacuum space receiving a phase-changeable working fluid therein, being retained in the heat sink and the first heat conductor in such a manner that an outer periphery surface of the heat transfer device is tightly enclosed by the base and the first heat conductor;
• wherein the LEDs are distributed on the first heat conductor.