Planning How does Liquid CCFL lighting work?

Does anyone know how companies like logisys make the "liquid" effect to these lights. Or any way of making the same effect in a plexi tube.

heres a link to a vid that shows a purple liquid ccfl in action

 

Usually it's a glass tube filled with glass beads, then they make it the same as a standard neon tube. The arc will find different paths between the beads making the liquid effect. You're not going to do it with plexi.

 

the logisys liquid ccfl are plastic of some sort are they not ?

 

Plastic outer tube to prevent breakage.

 

I have one of these, It's the same setup as a plasma globe, just in a little tube.

 

so not the easiest thing to make in a custom size....

 

Nope. Unless you have a friend in the neon sign business.