> light the LED(s). No, the, as one guy put it, "unicorn they are looking 
> for", is a way to make the actual tube itself "extend", without having to 
> have it a fixed length. There is no practical solution at this point for 
> doing that.

Your are perfectly right. I wanted to suggest some way that might allow to 
 >see< through a clear glass cylinder (without noticing LEDs), enhancing the 
illusion of extension. Frankly, to put my idea into work, you would have to 
do quite a bit of experimenting. Fiddling with pressures, dyes, voltages. 
Way too much work and expense for a party ;-)

Something that might actually work and look cool (though not at all like a 
lightsabre) would be putting a chain of miniature plasma globe emitters into 
a clear glass cylinder.

http://www.teslaboys.com/Plasma/MorePlasmaGlobes/index.html

I mean: take a plasma globe, shrink it's diameter to 3 cm, take 50 emitters 
and put them into a 1.5 m long glass cylinder. Fill it with Krypton, power 
up and enjoy.

If you could get it to work, it would look very cool, I guess.

Still - way too much work and expense for a party ;-)

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