Originally Posted by wnielsenbb
Or simply spend a few days with the gray screen and it's measly 27fl, then spend a few days with the hp screen and its lovely 60fL (assuming 2 gain) and see which you enjoy more. Of course the real test would be toward the other end of the bulbs life when you will be comparing 13.5fL from the gray with 30fL from the HP. If 60fL is too bright you could always use an nd2 filter for the first half of the bulbs life.
I am taking this all under advisement, but still playing devils advocate since no one else is
First, some updated calculations: The screen viewable area is actually 67x38, with that we get:
> .9 gain grey x 565(lumens)/17.67sqft = 28.77fL
> 1.0 gain white x 565/17.67sqft = 32fL (31.97 actually)
That's only a 3.2fL difference between .9 grey and 1.0 white.
Now, for those here that are the super high fL fanboys, what fL are you actually getting in your theater? You don't have to actually measure, but just calculate via screen size, gain and lumens your PJ is putting out calibrated (to D65 I assume). I can't imagine anyone is really getting 60fL
Lamp aging is a good point and something I've thought about. Yet with almost 29fL to start off with, I obviously can afford losing lumens over time. Remember, I don't watch sports/news on the PJ, just movies. I also don't like 'torch' modes, my LCD LED is calibrated at moderate brightness (backlight level), not store torch modes (which I hate). With the lights off at night, I can watch my LCD w/o squinting.
Now, I currently have a 60" matte white BO screen, probably 1.0 gain, so I'll be able to test it out before I buy the grey. I won't bother with a grey 'sample' as it seems to be a waste trying to judge a whole screen/image on just a few sq inches of a sample. But I already know that even with my Optoma H31 on this small 1.0 white screen, there were times in the past (new lamp) when even my guests squinted in slight pain as a scene switched from very dark to very bright. I would think that anyone getting 60fL from a large screen would literally have to put sunglasses on during bright scenes
ND2 filter> I've thought of this too. But it seems that a grey screen offers benefits the ND2 won't. This, and much of why I'm leaning towards a .9 grey can be explained in this short thread I started in October, and darinp2's article in HT secrets>http://www.avsforum.com/avs-vb/showthread.php?t=1186634http://www.hometheaterhifi.com/techn...s.html?start=1
I would venture to guess that most of you posting support for HP screens (or just against grey) and the like are running much bigger screens than me? I can understand that of course, if I was running a larger screen, I would not at all go for a negative gain grey, I'd go white. But my screen viewing area is gonna be only 67x38, matched to a PJ with 565 lumens in low lamp mode.