A lighting module includes at least one heatsink configured to dissipate heat generated by a light source, the heatsink including at least a base and a dissipation member, the dissipation member including a series of fins projecting from the base, each fin being defined by a summit that defines the length of that fin, and by two end edges extending between the summit and the base. The lighting module is configured to pivot about two pivot axes, and the series of fins includes eccentric fins the length of which is less than the lengths of the fins at the centre of the dissipation member, at least one fin further having at least one bevel at the junction between the summit and an end edge.