Low weight tube fin heat sink

A heat sink comprising a plurality of pin-shaped fins and a support, wherein each fin has a fin height relative to the support, a bottom part associated with the support and a top part, a cross-section having a first width and a second width having a ratio d1/d2 selected from the range of 1.2-10, and a first width axis, wherein the first width axes of the pin-shaped fins are arranged parallel, and wherein the pin-shaped fins are hollow over at least part of their fin height, wherein each pin-shaped fin comprises a fin wall with the fin wall defining a cavity within the pin-shaped fin having a cavity height, wherein the cavity has a cavity cross-section with a cavity cross-sectional area, wherein over at least part of the cavity height the cavity cross-sectional area reduces in a direction from the top part to the bottom part.

A lighting device comprising a light source and a heat sink according to claim 1, wherein the heat sink is configured to dissipate thermal energy from the light source when in operation.