The Spyder software measures the nits off the screen , so it eliminates the need to assume screen gain.Thanks. Yes, my SI screen is nominal 1.3 Gain. How close to 1.3 it really is, I don't know. The 85 - 96 range you indicate with true 1.3 Gain is quite close to my 100, so it's not that far off.
And I'll be checking the lux reading with the Dr. Meter in the near future, to verify this. As we all know, all products are going to have a range of specs (projector, bulb, screen material, etc.), so if I happened to be on the upper end of the specs, that might explain why I'm a little higher than expected overall.
In any case, specs aside, what I'm seeing far exceeds anything I've seen before in a projector, so there is that!