Heat exchange system for an automotive lighting device

A vehicle lighting device comprising a heat exchange system with a heatsink and an air duct, the air duct including:

• an air inlet portion including a first air passage area receiving an airflow into the air duct;
• an air outlet portion including a second air passage area directing the airflow towards a heatsink of the heat exchange system;
• and
• an intermediate portion disposed between the air inlet portion and the air outlet portion, wherein the intermediate portion is having a variable cross-section in a non-linear way, and wherein the largest section of the intermediate portion is superior to the section of both the first air passage area and the second air passage area
• wherein the air duct is arranged in such a way that the air outlet portion is facing the heatsink;
• and
• a light source, wherein the heatsink of the heat exchange system is in thermal contact with the light source to evacuate the heat generated by the light source.