An LED lamp includes a housing defining an opening in a front face thereof, a heat sink received in the housing and a plurality of LED modules mounted on the heat sink. The housing has two parallel horizontal plates at lower and top ends thereof. The heat sink includes a V-shaped conductive plate placed on the lower horizontal plate of the housing and has two differently-sized portions with front faces thereof defining an obtuse included angle therebetween. The front faces face the opening of the housing. The LED modules are mounted on the front faces of the portions of the conductive plate of the heat sink.