NOTES: I haven't had Mike, who has been calibrating most of our home theater projectors for the last decade, measure or calibrate 3D, but Ron recently did measurements and observations with his slightly brighter RS600U. The RS600U is about 15% brighter depending on modes. I've adapted what he wrote about 3D brightness in the italics below, to more closely reflect how the slightly less bright RS400 would most likely measure up in comparison.
As always, lumens measurements are always with the zoom at mid-point, unless otherwise stated. The lamp on this projector was at 8 hours when Mike worked with it.
"No 3D picture settings were changed in an attempt to maximize usable 3D brightness. The following examples would be for using the Cinema 3D default settings. When projecting onto a 100 inch (16 x 9) screen with a gain of 1.0 in THX 3D mode, the 3D picture viewed through the 3D glasses would have a an effective brightness of just under 9 foot lamberts. For a 120" gain 1.0 screen the effective brightness would drop to about 6 foot lambert The minimum standard for movie theaters is 12 ft lambert for 2D, although the standards are lower for 3D (primarily because they accommodated the first generation of 3D capable cinema projectors, which were pretty dim, in most theaters. Thus, if you want to use a reasonably large screen when using the projector's 3D modes, then using a screen material with some gain can help."
For example, with a 1.3 gain screen you would - without further tweaking, be just shy of that 12 ft lambert minimum.
Since the RS400U is fairly typical of today's $2000-$15,000 home theater projectors in brightness, that provides a perspective why I, who have a 1.3 gain screen typically describe my 3D experiences as reasonably bright at 100" diagonal, and typically report that at my full 124" diagonal that most projectors I review are definitely a bit dim, but watchable, at that size.
Post Calibration Results
For the RS400U calibration Mike decided to do the measurements for color temperature, for both low power and high.
The RS400U measured a whopping 1749 lumens calibrated.
- High lamp mode, midpoint on the zoom lens
The RS400U measured 1192 Lumens after calibration
- Low lamp mode, midpoint on the zoom lens
He saved Low Power configuration into User 1, High Power into User 2