Hello. Here is a tutorial I made for creating a lightsaber via the composite nodes in blender, for like a picture. It is aimed for the complete noob to blender, since someone who has never used blender could follow this tutorial. I plan on making two more along with this, one for 3d animated characters using lightsabers, and for taking it a step further and making a moving lightsaber on video. Well for now, here is the lightsaber tutorial. If you want you can navigate the site, but mind you it is still a WIP.