Solid state lighting lamp

1. A solid state lighting lamp comprising:

a plurality of heatsink modules each extending in alignment with a central axis of the lamp, each heatsink module having an outward facing surface and an inner surface opposite to the outward facing surface, and carrying a plurality of solid state lighting elements on the outward facing surface;

a body extending in alignment with said central axis and delimiting an inner volume of the lamp, wherein the body is cylindrical and defines a light exit window of the solid state lighting lamp, and each heatsink module is affixed to an inner surface of said body;

a base including an electrical connector; and

a cap opposite said base;

wherein the body and the heatsink modules extend between the base and the cap, and each of the cap and the base comprises a plurality of air vents, so as to generate an air flow substantially in parallel with the central axis through the solid state lighting lamp;

wherein each heatsink module is affixed to said body by at least one tongue and groove coupling.

2. The solid state lighting lamp of claim 1 , wherein the air flow runs over the solid state lighting elements on the outward facing surface of the heatsink module and over the inner surface of the heatsink modules.

3. The solid state lighting lamp of claim 1 , wherein each heat sink module is made of a bent sheet metal.

4. The solid state lighting lamp of any of claim 1 , further comprising a further body within the body and a driver for said solid state lighting elements housed within said further body.

5. The solid state lighting lamp of claim 1 , wherein each plurality of solid state lighting elements is arranged as at least one linear array of solid state lighting elements aligned with said central axis.

6. The solid state lighting lamp of claim 1 , wherein the lamp is a high pressure sodium (HPS) or compact fluorescent lamp (CFL) replacement lamp.