Originally Posted by omicronian
Wait a sec... they have shutter glasses that cause "no significant loss of light" ?
Maybe they had their setup for 2D bright enough that it didn't cause a perception of too much loss. Human eyes can be pretty bad at judging light levels and I think that especially applies when a dimmer setting has sufficient light and another is much brighter. For instance, at CEDIA a few years ago Marantz was showing their 3 chipper and their single chipper. By measurements the 3 chipper should have been much brighter, but in the time it took to switch between the 2 projectors they didn't really look all that much different in light levels to people in the audience who commented (and I think to Dan Miller, who was doing the presentation).
If you get down from say 12 ft-lamberts for 2D to 4 for 3D I think the perception of loss of light could be a lot more than if going from 36 ft-lamberts for 2D down to 12, just as an example.