Various embodiments may relate to a lighting device, including a housing, at least one light source, and a circuit board carrying the at least one light source. The housing defines a cavity for accommodating the at least one light source and the circuit board. The housing includes a bottom for carrying the circuit board. The lighting device further includes at least one separate mountable locking member, which is partially supported on the housing and presses the circuit board on the bottom. In addition, various embodiments further relates to an illuminating device including the lighting device.