Tryed another graphics card too, but it's the same.
So if it's not a problem with my sensor, then it's my projector that have a problem i supose ! Bad. I don't see myself telling optoma support that my green is not good.. i don't think they will do something in order to fix this !
Just thinking about something, i'm using a white wall for projection, but a white that is quiet warm in color. Sure it should have an impact on color, but an impact on the green that much, is it possible ? I already tryied to mesure the CIE with the sensor facing the lens (with diffusor attached), but didn't see a much of a difference, but not sure if i did it well.