The present invention relates to a lamp, including a half mirror having upper and lower surfaces to reflect a part of light incident on the lower surface and discharge another part to outside, a first reflector located below the half mirror to be vertically spaced so as to face the lower surface of the half mirror, a plurality of light sources to emit light between the half mirror and the first reflector, and a second reflector located between the light sources to reflect at least some of incident light, wherein the half mirror and the second reflector face each other, such that light emitted from a part of the light sources is repeatedly reflected between the half mirror and the second reflector, and wherein the first and second reflectors face each other, such that light emitted from the remaining light source is repeatedly reflected between the first and second reflectors.