Patent ID: 8021023

Claim:
An LED (light emitting diode) illuminating device, comprising: an optical module comprising an LED light source, the LED light source being provided with a plurality of LEDs; and a heat dissipation device arranged on the optical module, the heat dissipation device comprising a housing and a heat sink located above and hermetically mounted on the housing, the heat sink comprising a base and a plurality of spaced fins formed on the base, the base having an inner surface facing the housing and an opposite outer surface, the fins extending outwardly from the outer surface of the base, the housing comprising a bottom plate, the bottom plate having an evaporating surface facing the base of the heat sink and an opposite heat absorbing surface, the LEDs of the LED light source being thermally attached to the heat absorbing surface of the bottom plate, the heat sink and the housing cooperatively defining a hermetical chamber therebetween, a closed sidewall of the chamber being sandwiched between the base of the heat sink and the bottom plate of the housing, a wick structure being received in the hermetical chamber and attached to the heat dissipation device at a periphery of the hermetical chamber, a working fluid being filled in the hermetical chamber and saturated in the wick structure.