Originally Posted by millerwill
Tx much for making those measurements! If I convert to lumens, I get the same for both screen sizes (which of course SHOULD be true): in best mode, this is ~ 575 lumens in low lamp, and 768 in high lamp.
That is right. I should have noted that I used a closest throw modifier of about a 10% increase to make Art's mid-zoom
numbers be closest throw, which is why 700 lumens in best mode becomes about 770. It would decrease about 10% for mid-zoom, or 20% for farthest throw.
Also, I'm not sure how much exact light you lose in 3D for the Mits, but assuming around 70% to 80% lumen loss with the glasses on, it might even be big enough for 130" with an HP 2.4 gain screen mounted at closest throw in a dynamic like mode (semi-accurate non-best mode), at least until the lamp gets some wear. The problem as always becomes having a ridiculously bright and unwatchable 2D image just to get 3D brighter.
So far it seems like the ideas to handle this "too bright for 2d" problem are:
1) Buy a smaller tripod gain screen (like 100" or less) and put it in front of your regular screen when you wish to watch 3d.
2) Switch from shelf mounting back to high
ceiling mount to reduce gain with the HP screen when ceiling mounted.
3) Maybe an ND filter, but some people said they don't like it
4) Of course the IRIS helps some eventually, but it won't compensate down enough for 2.2 gain, that's too much gain for 2D at first