This saber contains a kyber crystal and emits a green plasma blade. Its hilt is similar to that of Obi-Wan Kenobi’s lightsaber (as seen in The New Hope), as Skywalker modeled his weapon on his late Jedi Master’s lightsaber
The V2 version was mostly used during stunt / combat phases in the Return of the Jedi. The other version called “Hero” was used for close-up and more official design of Luke’s Lightsaber. While the V2 is very close to the Hero general design, the control box and clamp section are quite different (closer to Obi-Wan design). The V2 body is also covered by a very characteristic black weathering / paint, showing heavy use.
There is a deleted scene from Star Wars: Episode VI Return of the Jedi in which Luke assembles and activates his lightsaber for the first time. The clip was later included in the saga Blu-ray boxset.