A Light-Emitting Diode (LED) lamp having an adjustable illumination angle, comprising:
- a lamp housing configured to have LEDs for emitting light embedded therein, have a front thereof opened so that the light of the LEDs is radiated, have an angle adjustment groove formed laterally and lengthily, with a cross-section having a top portion in a partially circular shape cut through two edge points on a circle with respect to the center of the circle and a bottom portion with a central portion raised upwards from a straight line connecting the two edge points of the circle, and having outside concave-convex parts formed in a convex and arc shape on both sides of the angle adjustment groove, wherein bottom floor portion of the angle adjustment groove comprises a horizontal planar portion and two upward planar portions, each of which connecting a side of the horizontal planar portion and one of the two edge points;
- a guide block formed in a semi-cylindrical shape, comprising a screw tap formed in a semi-cylindrical shape on an outer circumference thereof and inserted into the angle adjustment groove of the lamp housing and fixed movably along the angle adjustment groove, wherein the guide block has a substantially flat bottom surface, wherein a portion of the flat bottom surface of the guide block is guided by the bottom floor portion of the angle adjustment groove;
- a fixing block configured to have an inside concavo-convex part formed in a concave and arc shape under one side of the fixing block so that the inside concave-convex part corresponds to the outside concave-convex parts of the lamp housing, having the other side spaced apart from the inside concavo-convex part and adhered to the structure and comprising a first through hole formed to penetrate the inside concavo-convex part, and a second through hole spaced apart from the inside concavo-convex part and formed to penetrate the fixing block on the other side of the fixing block adhered to the structure;
- a first fastening member configured to penetrate the inside concave-convex part of the fixing block and fastened to the guide block inserted into the angle adjustment groove so that an angle of the lamp housing fixed to the fixing block is adjusted and the inside concave-convex part is closely adhered and fixed to the outside concave-convex parts;
- and
- a second fastening member fixed to a structure through the second through hole of the fixing block in a state in which the second fastening member is spaced apart from the first fastening member,
- wherein the second fastening member fixes the fixing block to the structure on the other side of the fixing block in a direction identical with or different from the first fastening member,
- wherein a latching jaw engaged with a bottom of the guide block is formed in the angel adjustment groove,
- wherein the angle adjustment groove and the guide block are configured to be adjusted in various angles for enabling a radiation angle of light from the lamp housing adjusted at least in three angles.