A support element for a lamp module adapted to precisely accommodate at least one part of the lamp module that comprises an alignment member of the part, wherein the support element comprises at least one alignment member of the element, wherein the alignment member of the part forms, with the alignment member of the element, a pair of specially shaped complementary alignment members adapted to define the relative position of the support element and the given part by tightly fitting a protrusion on one member of the pair into a gap on the other member of the same pair. Furthermore, the object of the invention is a lamp module comprising the support element and a method of lamp module assembly on such a support element.