Abstract: The invention provides a lighting device comprising a light source unit (50), a ventilator unit (30) and a heat dissipating unit (40), wherein the heat dissipating unit comprises a main body (400) having a first surface (401) and a second surface (402), at least one first aperture (403), at least one second aperture (404) and a first set of fins (405) attached to the second surface. The at least one first aperture is formed by perforating the first surface and the second surface, and the at least one second aperture is located around the at least one first aperture at a distance therefrom. At least one fin is configured in arc shape extending from the first aperture toward the second aperture and the ventilator unit is positioned to cover at least part of the fins. Thus, the heat dissipating efficiency is improved because a greater airflow passes through the heat dissipating unit due to a high flow speed resulting from the low resistance.