If you own Fallout 4 for PS4 and you're interested in a Lightsaber-type weapon for your character, take a look at this sword from developer scientist711.
With the Lite Sword mod installed you'll gain access to a unique looking sword that features a solid design, a high amount of energy damage, nice range, and some nifty sound effects.
It's an excellent alternative to the Lightsaber mods out there for the PC and the Xbox One and a solid addition to any character's arsenal.
The sword is located in the studio at Hubris Comics which means it might take some work to obtain it. If you've already cleared the store, it's an easy pickup.