A light source device includes a circuit board, a solid state lighting element, and a hollow cylindrical metal reflector. The circuit board has a circuit layer formed thereon. The solid state lighting element is placed on the circuit board and electrically connected to the circuit layer. The hollow cylindrical metal reflector is placed on the circuit board and insulated from the circuit layer. An inner surface of the reflector surrounds the solid state lighting element to reflect and direct light from the solid state lighting element towards an opposite side of the reflector to the solid state lighting element.