Patent ID: 7513653

Claim:
An LED lamp, comprising: a lamp base defining a plurality of vents therein; a heat sink mounted on the lamp base and comprising a cylinder at a centre thereof and a plurality of fins being spaced from and surrounding the cylinder, the cylinder having a through hole defined therein, which communicates with the vents of the lamp base and cooperates with the vents to form an air passage communicating with ambient air, an included angle defined between each of the fins and a central axis of the cylinder; and a plurality of the LED modules thermally contacting with outmost ones of the fins of the heat sink, respectively; wherein the heat sink has a plurality of conducting arms extending outwardly from an outer wall of the cylinder, the fins are formed at two lateral sides of each of the conducting arms, and a height of the each of the conducting arms from the outer wall of the cylinder increases gradually along an axial direction of the cylinder.