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Projector Lumens
I have an outdoor event that takes place at night on the beach the client wants to project rear screen on 10.5×14 ft. will two 5,000 lumens lcd projectors stacked be sufficient. There is very little ambient light because its at night and no direct ligh on the screens.
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3 Replies
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Under normal and dark circumstances I would use only one 5000 AnsiLumen projector (correct rearprojection foil, no operafoil or other), so yes with two stacked 5000-projectors you are definitely on the save side.
alex
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The way I’d assess any such scenario is to calculate the ‘Foot Lamberts’ that (theoretically) falls onto the screen surface –
Surface area = 10.5x14ft = 147 sq. ft.
ANSI Lumens of Projectors = 5,000
with 2 projectors, I suppose that would be x 2 as an approximation, equvalent to 1 x 10K projector.
Therefore, 10,000/147 = 68 ft. lambert.Compare this with the norm (by today’s standards) as aLexx has advised, i.e. 5000/147 = 34 ft. lambert.
68ft lambert is therefore pretty bright, and if I may say so, more than satisfactory. I’ve used a 10K Christie Roadie in a darkend huge convention hall onto a 20×16 rear screen, for an audience of 3,000. That’s 31.25 ft lambert, and there was not a whisper of a complaint.The above is a simple calculation, but the principle is useful when one examines different screen sizes with other ANSI-rated projectors.
Thomas Leong
PS. to Bob, et al…If I’m wrong in the above, please say so. I’m still learning and would like to know the where, why and how.
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Thanks for the advice gentlemen.
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