Lighting module and lighting system

A lighting system, comprising:

• a system casing, having a top surface, a system airflow inlet and a system airflow outlet, wherein the system airflow outlet and the top surface are located substantially at the same side of the system casing;
• and
• a lighting module, disposed at the system casing and comprising:
• a light source, having a light emitting surface and a bottom surface opposite to the light emitting surface and capable of providing a light beam emitted from the light emitting surface;
• a heat sink, disposed at the bottom surface of the light source and comprising a heat sink mass with a heat dissipation surface, wherein the heat dissipation surface is opposite to the bottom surface;
• a case, disposed to the heat sink and having a module airflow inlet and a module airflow outlet;
• and
• a fan, disposed to the case or the heat sink for driving an airflow to sequentially pass through the module airflow inlet, the heat sink, and the module airflow outlet,
• wherein the case is capable of making a flowing direction of the airflow passing the module airflow outlet the same as a light emitting direction of the light emitted from the light emitting surface, the module airflow outlet is communicated with the system airflow outlet for the airflow exiting from the module airflow outlet flowing out of the system casing via the system airflow outlet.