Saber Forum

has anyone here considered using a 10w white cree from a tac light as a main light source for a stunt saber that might be able to use a purple blade from other sources?

It is unlikely to give you the full effect you want. Even when using a brighter white (but is it really? Need too look at the spec sheet for lumen output and the power setting used) the colored blades filter out visible light to let through only the color of the blade, reducing the amount of visible light being released overall. On top of that purple day blades are notorious for being very dark. One of the "other sources" that had these available clearance priced and dropped the purple from their inventory because it couldn't show bright enough for them.
Color mixing, even in a stunt, is the way to get satisfying illumination. Colored blades really only help with making the blade color show under sunlight/ bright light.

Point for this correct and accurate description, in an accessible way, of the physics of light and the easily-misunderstood specs put forth by the LED manufacturers.  (And let's not forget the "exaggerations," "truth-stretchings," "laboratory results," and outright lies told by unscrupulous LED sellers.)