The device forms a single unit that includes the way by which the evaporation of active substances is achieved, as well the way that allows automatically lighting a small lamp or LED that emits a small light illuminating the container of the active substance to be evaporated. This allows one to see the contents in the dark and, in addition, constituting a light in the dark for the area surrounding the device, with the particularity that the volume of this device does not increase with respect to the devices meant to individually evaporate active substances and emit a light. The design of the device includes a general casing comprising a pinholder body for a plug and the container itself for the active substance, in such a way that the body incorporates a sensor that emits a signal for the automatic activation of the lamp or illumination LED when the light intensity is below a pre-established threshold.