A lighting module (150) and a method (100) of manufacturing a lighting module, wherein the method comprises the steps of providing a heat sink material (120) in a fluid state and providing a light-source assembly (110) comprising a plurality of light sources (111) being electrically connected to a carrier (112), wherein each of the light sources has a light-emitting surface (113). The method further comprises the steps of embedding (130) the light-source assembly into the heat sink material such that the carrier and a part of each of the light sources are covered by the heat sink material while the light-emitting surface of each of the light sources is uncovered by the heat sink material, and solidifying (140) the heat sink material.