Abstract: A light emitting diode (LED) lamp includes a base, LED chips mounted on base, and a lens covering the LED chips and engaging with the base. The lens includes an arc-shaped engaging portion, and an extending portion extending from a radial outer side of a top surface of the engaging portion with a radial inner side of the top surface of the engaging portion exposed. The engaging portion includes an outer side surface. A groove is defined in an underside of the engaging portion and receives the LED chips therein. The extending portion includes an inner light emitting surface extending upwardly and outwardly from the top surface of the engaging portion, an outer light emitting surface extending upwardly from a top edge of the outer side surface of the engaging portion, and a top light emitting surface interconnecting the outer light emitting surface and the inner light emitting surface.