An LED lamp includes a top cover, a heat sink, and a conducting member, a plurality of light bars and a light cover. The top cover has a plate and a head extending upwardly from a centre of the plate. The heat sink has a conducting tube coupled to the plate of the top cover and a plurality of fins extending outwardly from the conducting tube. The conducting member is received in and thermally contacts with the conducting tube, and has a top surface attached to the plate and an inner surface on which the plurality of light bars are mounted. The inner surface is oriented downwardly and concaved from a bottom of the conducting member. Each light bar has a printed circuit board and a plurality of LEDs thereon.