Because your murderous wasteland rampage needs a little extra something, don't you think? "Lightsaber Renew" is a cool Fallout 4 mod created by invalidfate. Not only does it let you equip a lightsaber, it also comes with the appropriate shoom sound effects whenever you unleash it. You get a few colour choices, too, including red, blue, green, and pink lightsabers.
Here it is in action, courtesy of bloodironzero:
And Chayification here walks you through how to actually activate this mod in-game:
If this is of interest to you, make sure to download the lightsaber mod here. You might find that destroying the Commonwealth with a red lightsaber after being spoiled on The Force Awakens is actually pretty damn therapeutic!