Lighting device comprising: - a support body defining a tubular cavity that develops along a longitudinal axis (X) and provided with a first end and a second end aligned along said longitudinal axis (X); - a support element attached to said first end ; - a light source of the LED type installed in said tubular cavity and on the support element and configured to emit a beam of light (F) along said longitudinal axis (X); - a closing element associated with the second end of the support body and provided with a through aperture aligned with said longitudinal axis (X), wherein the lighting device comprises a first lens and a second lens , distanced from each other and from said through aperture , positioned in said tubular cavity and aligned with said longitudinal axis (X), wherein said first lens is configured to receive the beam of light (F) from said light source and generate a beam of light with parallel rays (R) toward said second lens , and said second lens is configured to receive the beam of light with parallel rays (R) from said first lens and convey it in a collimated beam (FC), passing through said through aperture , wherein the distance between the first lens and the second lens is comprised between 0.9 and 1 times the distance between the light source and the first lens , characterized in that the width (D) of said tubular cavity is comprised between 2 and 3 times, preferably between 2 and 2.5 times, the diameter (D1) of said through aperture , and the distance between the second lens and the through aperture is comprised between 0.7 and 0.8 times the distance between the light source and the first lens . - a support body defining a tubular cavity that develops along a longitudinal axis (X) and provided with a first end and a second end aligned along said longitudinal axis (X); - a support element attached to said first end ; - a light source of the LED type installed in said tubular cavity and on the support element and configured to emit a beam of light (F) along said longitudinal axis (X); - a closing element associated with the second end of the support body and provided with a through aperture aligned with said longitudinal axis (X), wherein the lighting device comprises a first lens and a second lens , distanced from each other and from said through aperture , positioned in said tubular cavity and aligned with said longitudinal axis (X), wherein said first lens is configured to receive the beam of light (F) from said light source and generate a beam of light with parallel rays (R) toward said second lens , and said second lens is configured to receive the beam of light with parallel rays (R) from said first lens and convey it in a collimated beam (FC), passing through said through aperture , wherein the distance between the first lens and the second lens is comprised between 0.9 and 1 times the distance between the light source and the first lens , characterized in that the width (D) of said tubular cavity is comprised between 2 and 3 times, preferably between 2 and 2.5 times, the diameter (D1) of said through aperture , and the distance between the second lens and the through aperture is comprised between 0.7 and 0.8 times the distance between the light source and the first lens . <EOS>