The picture should be just as bright for a 3d projection. Unfortunately, that means a more expensive light source (or two separate ones). The decision to simply

The picture should be just as bright for a 3d projection. Unfortunately, that means a more expensive light source (or two separate ones). The decision to simply use an old lamp at half intensity may have made immediate cost-cutting sense, but it's damaging the 3D brand. Case in point, Tron 2 3D was dim to the point that I removed the polarizers for the 2d-only scenes. The difference is quite visible.