The utility model discloses a lamp. The lamp comprises a radiator, a light emitter and a lens structure. The radiator comprises a cup body, an extending base and a plurality of cooling fins. The cup body is provided with a front face, a containing groove and an outer surface. The front face caves inward to form the containing groove. The outer surface is connected with the periphery of the front face. The extending base is connected with the outer surface. The extending base and the containing groove are located on the two opposite sides of the cup body respectively. The cooling fins are arranged on the extending base and are back on to the cup body. The light emitter is arranged at the bottom of the containing groove. The lens structure is contained in the containing groove and is borne by the cup body at the position of a through hole. The lens structure and the light emitter are coupled optically.