I believe the higher speed color wheels are less prone to this issue. For example, a 2 or 3x wheel is more likely to show the rainbows, then a 5x or higher wheel projector. Also, I'm not sure all people suffer from "Over the Rainbow" issues. \:\)

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85