YesWould I just get the 4240 and put it in between the receiver and projector?
All Lumagen's don't come with ChromaPure - or CalMan. It is a package deal the video calibration software companies offer.how easy is it to setup?http://www.chromapure.com/products-lumagenPro-new.asp Here it says it comes with a meter, and software chromapure. Do all lumagens come with this? If i were to calibrate the projector (I've never done it with a meter) is it easy? How automated is it?
or do I get a i3 Display pro 3 and use HCFR?
or CalMan ?
lastly I don't understand the 3D LUT do I need it?
I can't comment on how easy it would be for you to do all of the calibration, implement 3D LUT, etc. I bought my first Lumagen (from CalMan) in order to be able to calibrate my projector, similar to what you are considering. At the time (maybe 8 or 10 years ago), it was anything but fully automated, though some portions were. And I clearly did not (and still don't) have the underlying knowledge to be able to successfully take full advantage of what it had to offer. That should not imply that you won't.
So instead of buying the Lumagen from ChromaPure (or CalMan), I bought my current one from someone who is an approved Lumagen Calibrator. There are a few of them but Craig Rounds (from whom I bought mine) is one as is Kris Deering. I'm sure there are others. Not inexpensive but you would be confident of getting the most out of your Lumagen/projector. That hardware is a significant investment and extracting all it has to offer would seem the logical choice.