An exemplary embodiment of the present invention comprises: a light-emitting part including a board and a plurality of light-emitting devices disposed on an upper surface of the board; a first reflection surface located on one side of the light-emitting part; and a second reflection surface located on the other side of the light-emitting part, wherein the first reflection surface and the second reflection surface comprise a reflection part having a parabola shape; and a lens disposed on the light-emitting part between the first reflection surface and the second reflection surface, and each ofthe light-emitting devices is arranged to be aligned with a parabola-shaped focus, and the height of the reflection part is defined by equation 1.