A light source device includes a circuit member, a heat dissipation component, an optical component and light emitting diode assemblies. The circuit member defines spaced through holes. The light emitting diode assemblies have a first side and a second side opposite to the first side. Each light emitting diode assembly passes through a corresponding through hole and is electrically connected to the circuit member. The heat dissipation component contacts the first side, is spaced from the circuit member, and is configured to dissipate heat generated by the light emitting diode assemblies. The optical component contacts the second side, and is configured to distribute light emitted from the light emitting diode assemblies.