brightness (a) x screen size(b) = what projecter? ????? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 2 Old 08-07-2014, 03:21 PM - Thread Starter
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brightness (a) x screen size(b) = what projecter? ?????

So my problem is trying to figure out how big of a screen to get. I have room to go as large as I really want to, but the problem is how do i figure out how which projector will work for me other than just looking at the lumens? I have seen small cheap projectors that claim to light up to 200- 300 inches and others that cost several thousand dollars that have a hard time filling up 120, let alone 3d. so if anyone can give me a guide as to what to look for that would be great. Thanks in advance.
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post #2 of 2 Old 08-07-2014, 07:19 PM
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Theaters (and many users) try to aim for 14ftL. which is lumens divided by screen size in square footage. An example would be a 500lumen projector on a 110" screen (which is 8x4.5=36ft square at 16:9)..that's 500lumens/36ft = 13.9ftL. More than enough for bright 2D.

Many users seem to be fine going as low as 10ftL, but it is common for 2-3.5ftL (with gamma still set very dark) to get complaints. I would recommend aiming a little higher for 3D unless you can recover decently with gamma control (15ftL+ is likely a good spot to be for 3D).

110" needs 430lumen for 12ftL, or 540L for 15ftL
120" needs 570L for 12ftL, or 715L for 15ftL
130" needs 605L for 12ftL, or 750L for 15ftL
140" wants 700@12 or 875@15
150" wants 800@12 or 1000@15

Both the top recommendations for their price categories (w1070 and hw40) make 800+lumens in eco and around 1400lumens with full-lamp at very accurate settings which will keep you safe for lamp dimming over time even on a 150" screen.

Simple <$250 dedicated black-fabric theater room, build in a day, takedown in an hour.
Easy $25-40 DIY black/dark-grey ambient-light rejecting screen, grab two things from a local store..mix..roll..done.

Last edited by Ftoast; 08-07-2014 at 11:03 PM.
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