actually, compairing my brothers 3.52m33-4 at highest brightness, and my 3.71 M33-2, it looks to me like it just completely skips a level... May just be my eyes though, but ill be damned if I can tell the difference between the two highest settings.

But aside form that, off hand I don't know one, or which one in flash controls it but I can do some digging for you. I'll post back if I find anything zinga.