An LED lamp includes a plurality of barrel-type holders and a plurality of LED modules mounted on an outer surface of each of the barrel-type holders. Each of the barrel-type holders has a small opening end and a large opening end opposite to the small opening end. The barrel-type holders are coaxial with each other, with a larger barrel-type holder enclosing a smaller barrel-type holder. The small opening ends of the barrel-type holders face downwardly, while the large opening ends face upwardly.