this requires 3 layers so you should just use for pictures, or short tests. any-way, all the layer's 4-point feather will be 4. Layer 1: The neon glow will have the size 24 and the spread 6. Layer 2: Core feather 21, size 65, and spread 15. Layer 3: Copy layer 2 and make the core feather 13 and voula! instant lightsaber, lightsabre, lightsword, Neon light or whatever it is that you call it!
P.S. I used the default coler of red so I don't know about different colors but try it!
default= don't do any thing to it.