cold cathode fluorescent lamps, like the kind that light up your laptop display. They come in a variety of colors.
I can't attest to their fragility but it might work if you want to not spar with your saber so equipped.
Also, power supply might be an issuer too. A lot of model kits I've seen made and illuminated with these have had to have 110 volt power adapters. There might be an option for C or D cell batteries, I haven't gotten that far yet.
Whether they are made in the lengths of saber blades, I am unsure but if they do, it would make a very cool lighting technique but like I say, they are fragile. I'm sure the saber blade could made to properly diffuse the light of the CCFL. Perhaps color the blade and have a white CCFL through the center of the blade to make it appear more realistic instead of one solid color.
these things are cool and I'm just adding my 2 cents.
thanks for reading!
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