I had 2 AI Sol Blues over a cube and there was slight disco ball effect in spots on the sand, none on the rock or coral. I also have a single Radion G2 over a 29g reef and there is no disco effect whatsoever, I don't really have any sand in this tank however (just a dusting here and there) so I can't say if it would be visible on a complete sandbed or not. The Radions advertise that they use reflectors instead of lenses just like the Mitras advertise, whether this actually makes any difference or not I couldn't say. My 29g is 30" long and I do find the Radion reaches the far edges of the tank a little better than the Sol and it is a brighter light fixture. I found the Sol controller simpler to use than the Radions and was suprised to find the Radion doesn't have a lunar cycle in the software (you would think natural mode would replicate natural lighting day and night). The only other thing I don't like about the Radion is the huge power supply that you have to hide somewhere.
I haven't seen the Vegas in action but have heard they are the worst for the disco effect, which is of course subjective to the individual. The nice thing about the Vega is that each individual LED has it's own controllable channel instead of just the color groups being lumped into a channel. I guess this could also mean endless tweaking of the colors which may be good or bad depending on how much you like to fiddle with stuff.
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