Patent ID: 8047674

Claim:
An LED illuminating device, comprising: a light-emitting module comprising an elongated hollow light penetrable tube and a light source received in the light penetrable tube, the light source being provided with a plurality of LEDs; a heat sink received in and mounted to the light penetrable tube, the heat sink comprising an elongated base and a plurality of fins extending from the base, the base having a top surface and an opposite bottom surface, the fins extending upwardly from the top surface of the base, the light source being thermally attached to the bottom surface of the base, the base defining a plurality of fixing holes in the bottom surface thereof, the light source facing a bottom portion of the light penetrable tube and light emitted by the light source being guided to an outer environment through the bottom portion of the light penetrable tube, the base of the heat sink and an upper portion of the light penetrable tube cooperatively defining a heat dissipation chamber therebetween, the fins of the heat sink being accommodated in the heat dissipation chamber, the light penetrable tube defining a plurality of air exchanging holes through the upper portion thereof, the air exchanging holes communicating the outer environment with the heat dissipation chamber for air flowing into and out of the heat dissipation chamber; and an electrical module comprising at least one circuit board and two end covers, the at least one circuit board being received in the heat dissipation chamber and electrically connected to the light source, the two end covers being arranged at two opposite ends of the light penetrable tube; wherein the light source further comprises at least one elongated substrate attached to the bottom surface of the base, a plurality of electrodes formed on the at least one substrate, the plurality of LEDs being arranged on the at least one substrate and evenly spaced from each other along the at least one substrate; wherein a longitudinal length and a transverse width of the substrate are greater than those of the base; wherein a plurality of through holes are defined near two opposite lateral sides of the substrate corresponding to the fixing holes of the base; and wherein at least one air venting hole is axially defined in each of the two end covers and communicates with the heat dissipation chamber.