A lighting device, preferably for outdoor environments, which extends predominantly along a main axis (X-X) comprising: - a support stem extending between a first base end, and a second head end; - a lighting cap comprising: i) a bell having a housing accessible through an opening and laterally defined by a side wall, wherein the second end is housed in said housing through said opening; ii) a lighting element housed at least partially in the bell, electrically connected to the electrical transmission grid preferably through the stem, comprising a light source; iii) a central group supporting the lighting element and suitable to fasten the stem to the bell, wherein the central group comprises a first portion, a second portion and an engagement element, arranged therebetween, wherein the central group is configurable in a disengaged configuration, wherein the first portion and the second portion are axially separated from each other and the engagement element is radially disengaged from the bell, and in an engaged configuration, characterized in that the first portion and the second portion are axially brought together in such a way as to perform an action on the engagement element which in turn performs a radial action on the side wall of the bell. - a support stem extending between a first base end, and a second head end; - a lighting cap comprising: i) a bell having a housing accessible through an opening and laterally defined by a side wall, wherein the second end is housed in said housing through said opening; ii) a lighting element housed at least partially in the bell, electrically connected to the electrical transmission grid preferably through the stem, comprising a light source; iii) a central group supporting the lighting element and suitable to fasten the stem to the bell, wherein the central group comprises a first portion, a second portion and an engagement element, arranged therebetween, wherein the central group is configurable in a disengaged configuration, wherein the first portion and the second portion are axially separated from each other and the engagement element is radially disengaged from the bell, and in an engaged configuration, characterized in that the first portion and the second portion are axially brought together in such a way as to perform an action on the engagement element which in turn performs a radial action on the side wall of the bell. i) a bell having a housing accessible through an opening and laterally defined by a side wall, wherein the second end is housed in said housing through said opening; ii) a lighting element housed at least partially in the bell, electrically connected to the electrical transmission grid preferably through the stem, comprising a light source; iii) a central group supporting the lighting element and suitable to fasten the stem to the bell, wherein the central group comprises a first portion, a second portion and an engagement element, arranged therebetween, wherein the central group is configurable in a disengaged configuration, wherein the first portion and the second portion are axially separated from each other and the engagement element is radially disengaged from the bell, and in an engaged configuration, characterized in that the first portion and the second portion are axially brought together in such a way as to perform an action on the engagement element which in turn performs a radial action on the side wall of the bell.