https://wccftech.com/star-wars-jedi-fallen-order-ightsaber-color-customization/

Star Wars Jedi Fallen Order provides some options to customize Cal's Lightsaber, but there is no way to create additional colors, alter the glow and so on. Thanks to a new mod, however, this has become possible on PC.

The Lightsaber Color Editor mod allows players to finally change the Lightsaber color as well as sounds. This mod finally allows players to also use a Red Lightsaber, a color that is typically reserved for Siths in the Star Wars universe.