Hey
Tan Djarka ! I'm not quite awake enough to answer this question properly, but I'll give you a bit of forewarning about asking questions at FX-sabers, some of the guys get really butt-hurt about questions that have been asked and answered over and over again, so just be prepared for some backlash from some of the guys to say you need to learn to read and then lock your thread.
SO, that being said, look up over there or just Google "Diffuser Tube", "Corbin Film", "Mirrored Tip", "Cellophane", "Gift Wrap", ...sorry, brain fart, I'm stuck.
You can also search over at The Custom Saber Shop's Forum, they sell blade film and have several threads about it over there too.
Another step in the evolution of blade technology is "Daylight Blades", "Photon Blades" (Vader's Vault), where they use a light reactive material inside the tubing to give vibrant colors in daylight. The downside is you're carrying around a brightly colored stick even when not 'lit'.
OH YEAH! ...also look up "Dual Diffused", <--- the air finally cleared out between my ears!

That's where you sand your blade tube on the outside and use blade film inside.
If I'm thinking sort of correctly about this, and forgive me if I'm mistaken, as the guys said, it was the toy industry that put the translucent foam tube diffuser inside the LED-string lightsabers that kicked off the whole "let's put stuff inside the blade" revolution. Then Corbin film. Then cellophane (though I'm still not certain that it's different from Corbin film). Then phosphorescent tubes.
Then of course there's the evolution of the lightsource from flashlight bulb, to single LED, to RGB LED, to LED-string, to TRI-Cree, to Quad-Cree, to Neo-Pixel. And if you search for "Disney Lightsaber Patent" they're working on an extendable tube.
There's a LOT of information out there and I never memorized it. All I've done is researched what look I liked for what blades I'm going to build for myself and gone out and purchased the material to do so. I still have to experiment with the materials I bought to get the result I'm hoping to achieve. Some of that info is still floating around in my head and that is all I can contribute presently.
I hope this helps point you in the direction of the answer you're seeking!