LED lamp

The utility model discloses an LED lamp comprising a lamp cover, wherein a substrate is arranged in the lamp cover; a part, positioned at the far-end of the substrate, of the lamp cover is provided with a fluorescent layer; a number of excitation chips are mounted on the substrate; the excitation chips comprise first support racks, second support racks, electric conduction adhesives, PN junctions and sapphires, wherein the first support racks and the second support racks are positioned on the substrate and are respectively used as P-type semiconductors and N-type semiconductors; near-ends of the first support racks and the second support racks are coated with the electric conduction adhesives, two ends of the bottom part of each PN junction are connected with the corresponding first support rack and the corresponding second support rack respectively through the electric conduction adhesives, the sapphires are mounted on the PN junctions, and the end faces of the bottom ends of the sapphires are connected with