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Bob's more literal interpretation is the correct way to read this, as the reference here is to the SMPTE recommendation for dark-room viewing. And yes, a larger screen would obviously reduce the brightness.

To Michael's point, though, the comment is perhaps not properly placing this in full context of our overall experience. In reality, we typically measure something between, say, 600 and 950 lumens of brightness on a Cinema or Film mode, the variance being the difference between the least bright and most bright lamp mode. So maybe this 920 lumens referenced would be acceptable, but without any ability on a "typical" 110-inch screen to reduce the light output to something more comfortable than what a high lamp mode would generate. That simply may be too bright and fatiguing for some people.

But I think there's a more subjective debate to be had here about how bright is too bright in terms of a peak-white reading OFF the screen these days (lumen measurements are taken facing the lens). Our columnist Terry Paullin, who has built home theaters for 30 some-odd years, recently wrote that he recommends a projector with enough output to generate a minimum of 25 ft-L coming off the screen and personally likes it up around 40 ft-L for his own viewing. (<a href="https://www.projectorcentral.com/installers-insight.cfm?2019-02-14-The-Big-Mistake&entry_id=768">See his article here.</a>) That 25 to 30 ft-L is a nice target for an HDR viewing mode on a 4K projector in actual use, but may be too bright for long-term viewing in a dark theater with SDR content for some people. But it won't be for others. I also lean toward a brighter pictures, and may end up with a measured 35 or so ft-L off the screen in SDR for a 100 IRE, 18% window (not full frame). For the HDR mode, it can be as high as 50 or more ft-L if the projector accommodates. Of course, you're viewing those 100% peaks very infrequently and the average picture level of most content is well below 50%.