Anyway to test for susceptability to rainbow effect?

Maybe a silly question but worth a try. The small southern city I live in has no places that sell projectors(we just got cans connected with strings for communication last week ) so seeing them in person would require an hour drive to another city. My question is there a way to test if rainbow effect bothers me....such as maybe a website...something like the color blindness test the military issues? I cant decide between the Infocus 4805 or a Sanyo until then. Thanks for any help.