First off, Welcome to the Forums Leo.
The Arod Megil is a great saber. So to answer your questions...
There is no purple LED, to get the color purple, we mix red and blue together. There are certain sound cards (Crystal Focus Version 6) which help tune in the color to the your perfect shade. Manually mixing the color is possible, you would have to experiment a lot with resistors on the red to get the shade that you want. You would need a Tri-Rebel R/G/B or a LedEngin RGBA or RGBW.
At the moment, purple AV's are NOT sold in the store, though that might change. IIRC, the AV switch in that video was custom made by FenderBender. He might be along sometime to chime in, as he did build that particular saber.
Good Luck.
Bookmarks