Dr. Beef's VR port of Jedi Outcast has the best implementation of the lightsaber effect I've seen. It's far better than the lightsaber effect in ILM's own Vader Immortal.
The lightsaber in Vader Immortal is clearly just cylinder that scales up and down (and gets extruded when you wave it) to mimic that pulsing effect with a billboard texture for the glow of the lightsaber. See a video of it in action here.
But I'm still trying to figure out how it's done in the VR port of Jedi Outcast. It's clearly more than just a billboard texture when you hold the lightsaber down and look at it from the hilt. Is it using an outline shader on the lightsaber blade geometry and applying the pulsating glow texture to the outline, or maybe using a bloom effect for the glow of the saber? Any ideas on how this effect is pulled off so I can do something similar in my game? Here's a video of it in action.