How to Figure Correct Gain Selection - AVS Forum
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post #1 of 3 Old 02-05-2000, 04:58 PM - Thread Starter
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How does one determine the correct screen gain when ordering a new screen.

I just received a Vutec Matte White screen w/ a 1.0 gain it was supposed to have been the 1.3 fabric but they messed up the order.

I am concerned that I may need a higher gain.

My configuration is as follows:

Screen size = 59 x 89
Seating distance = 12ft
Projector Distance = 17'
Projector Type = DILA (rated at 1000 Lumens but more likely ~500 lumens)

Steve
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post #2 of 3 Old 02-13-2000, 01:24 PM
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gages,

fL = (AL x SG) / ((SWI x (SWI x 0.67)) / 144)

where:
AL = Ansi Lumens
SG = Screen gain
SWI = Screen Width in Inches
fL = Footlamberts (10 recommended minimum for front projection).

This takes into consideration the phosphor utilization even with widescreen aspect ratios.

Don
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post #3 of 3 Old 02-13-2000, 01:27 PM
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Oops,

Should have been:

fL = (AL x SG) / ((SWI x (SWI x 0.75)) / 144)
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