It's harder to tell when you watch just 3d because eyes can adapt pretty well to low light. I removed my 3d glasses while watching the Avatar to check how it l

It's harder to tell when you watch just 3d because eyes can adapt pretty well to low light. I removed my 3d glasses while watching the Avatar to check how it looks. It was indeed much brighter and afterwards 3d felt quite dim (for some time, till my eyes didn't adapt again). Brighter 2d felt right and 3d was dim as opposed to 3d feeling normal and 2d being too bright. It's a bit like changing between good desktop LCD and notebook. If you work just on notebook, it feels perfectly ok, but if you have it side by side with a good monitor, it looks quite bad.