I chose the projector for its ability to produce the highest contrast (I found the DLPs were significantly better here) along with the most light output. The blinking rainbow effect is visible to me (and annoying) only when I am looking at the projector and invisible when I am looking at the screen.Not to mention the mutlicolored rainbow effect when shifting view. I don't know how people can stand that. Talk about triggering epileptic seizures. If I ever bought a projector, it sure as hell wouldn't be DLP. I would buy LCD only.
The projector I am using is a Acer P7500. I got it a couple of years ago at New Egg for around $1,600.
The reason the graphic should not change brightness when going from a low scan rate of say 20K to say 60 K is that the only difference is the number of times/second that the entire image is over written. The same number of photons/second strike the screen.
m0f,
All very good points.
As a tangent, I want to say I repainted my large projection screen this week. The area is too large to make a commercial screen affordable and when I bought the projector I constructed this screen and after perusing the forums (especially AVS) I had used a DIY mix to paint this screen called "magic mud". This paint claims to have gain of one. I was afraid of the high gain paints because I did not want to have to wear the projector as a hat to see an even projection without hot spots. The screen worked well for video (lots of HS kids, party/movies) and for lasers as well. After accumulating a few dings I decided to repaint and went with a particular commercial screen paint ( I won't hawk it here) with a claimed gain of 3.6 and...holly cow! It looks like a 1920 x 1080 monitor on steroids! It is now larger than our local theater and at least as bright and I actually decided to turn down the lasers (I never thought I'd say that). The dreaded hot spots did not appear and the viewing angle is still much wider than the room will accommodate. I suspect that an even high gain might be possible and this could improve the performance of video projections when the surface is dedicated for that purpose.