Yep, just drop the Red level down... My son did the exact same thing with his Emerald Catalyst cause he wanted the darkest purple he could get...
I've also played with dropping the Blue AND Red down, the blade is not as bright, but the colour is deeper and darker.... Play with the settings till you get it just right for you
![Smiley](http://saberforum.com/Smileys/default/smiley.gif)
Yeah, I've dropped them to R:12 and B:44 for a deeper purple, but you're right, it's at the expense of the brightness. On the other hand, in the dark, it's fine and not blinding!