Screen gain cannot disobey the laws of physics,...right?
I am interested in rear projection home theater only, but I believe the rules of screen gain apply to all screens. A screen cannot produce light, only reflect it or pass it through, as in rear projection screens. Vutec claims to have a rear projection screen called the Fusion HD, that claims a wide viewing angle plus a screen gain of 2, which is very high. In order to get gain, you must restrict the viewing angle to concentrate the light in a more narrow field of view. The Vutec tech guy I spoke to also claimed that their new front projection screens that had a gain of 6 had very wide angle viewing capabilities.
What is going on here? Is this the Twilight Zone? Is there something I am missing or not understanding about the phenomena of screen gain?