Small, retractable wrist blade

[AndyM]

hey guys :)
I'm making a wrist mounted retracting lightsaber (see assassins creed) with either a 5 or 8 inch blade. since it is so short would a 1W Red luxeon suffice or would i be able to mount the electronics for a 3w red in the same amount of space needed for a 1w?
Also has anyone tried a flat sheet or two of plexi glass wrapped in a diffuser of some sort to make a blade? would this require a specific lens?

oh, and i probably wont use a sound board, just to save space. the electronics are either going to be strapped to my arm in a small hobby box(maybe an altoids tin would work?) or on the mechanical device used to retract the blade, which will be about 12 inches.
Criticism is welcome :)

[Jedi-Loreen]

This topic does not belong in this section, I'm moving it.

[AndyM]

Thanks for the help, but my main enquiry was about the proper blade length and what LED would best fit it. I'm not building a hilt, the other info was side notes i thought i'd add.

[Jedi-Loreen]

I can move it to LED Blade discussion if you'd rather have it there.

[AndyM]

I don't mind, just sayin, i'm really interested in the shorter blade and how that would work, not so much the rest of the build :)

[Azmaria Dei]

i would still use a 3W LED. you can underdrive it however much you need.