Low voltage lamp (10) for external use, comprising: •—a hollow and sealed container body (31) consisting of at least two opening half-shells (11.1), filled with insulating gel (G) and containing a terminal connection block (12); •—at least one light source (L) having at one of its extremities at least one electrical and mechanical connection means (13) which is electrically branched by means of electrical wires (25) with respect to said block (12); wherein at least said wires (25) and at least one portion of said connection means (13) are housed in a sealed manner in said container body (31) by means of said gel (G), which encloses them like a cast, and wherein said gel (G) is configured to model its shape on said wires (25), said block (12) and said at least one portion of said connection means (13), in a reversible manner.