This is the 2nd thread that comes up with google when searching for ways to reduce the rainbow effect and and couldn't find one method here.. or nowhere to be honest. So this is a single post:
I have Acer's H5380BD, knew about the RBE before buying and omg, It was pretty damn annoying at first.
1. You CAN get used to it and learn to ignore them - they mostly appear when your eyes are MOVING between objects, never when they are focused on a steady spot. They become ignorable with any setting in time. The better the movie, the less that nasty effect will bother you
.. although you will see them forever probably.
2. Experiment with gamma. I use "bright" setting and they are pretty much gone in the movies. For me it worked so well that I'm almost completely happy now and will not gonna return the device. On the other hand, I don't care about the colors being "true", so if you do care about that stuff then run away
3.Gaming is usually pretty safe and RBE-free. Well, a white spot on a black surface will always make the rainbow appear.
3. "Avoid cheapo DLP if possible" is probably the best advice still
***avoid single chip DLP when you get the projector primarly as a presentation/classroom tool. That would be a bad bad mistake.