Patent ID: 7868525

Claim:
An LED illuminating device, comprising: an optical part comprising a light source therein; an electrical part comprising a rear shell and a circuit board received in the rear shell, the circuit board electrically connecting with the light source; and a heat dissipation part located between the optical part and the electrical part, the heat dissipation part comprising: a hollow front shell having a rear end and a front end opposite to the rear end, the rear end connected to the rear shell, the optical part being arranged in the front end of the front shell, the front shell comprising a circumferential surface defining a plurality of first air holes and a plurality of second air holes therethrough for allowing airflow flowing into and out of the front shell; a heat sink arranged in the front shell and located adjacent to the optical part, the heat sink comprising a solid base and a plurality of fins formed on the solid base; the solid base having a heat absorbing surface adjacent to the optical part, the light source being thermally connected with the heat absorbing surface of the solid base; and a cooling fan arranged in the front shell and located between the electrical part and the heat sink, an airflow produced by the cooling fan being introduced into the front shell via the first air holes, the airflow then flowing towards the heat sink and finally flowing out of the front shell via the second air holes.