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Topic: Lumens of lignt need for home theater
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Perry Sun
Film Handler
Posts: 11
From: Temecula, CA, USA
Registered: Mar 2000
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posted 08-06-2001 12:00 PM
Jack,You're much more likely to get the answer you need by going to the AVS Forum at www.avsforum.com which has very lively discussions on home theatre projection issues. Perry
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 08-06-2001 12:21 PM
If you have a matte white screen with a gain of 1.0, the number of lumens needed to light a 5.5 x 12 foot screen to 16 footlamberts is theoretically:(16 x 5.5 x 12) / 1.0 = 1056 lumens. However, this assumes the rated lumen output of your projector was for the 2.18:1 aspect ratio of your screen, and included factors such as light loss in the optics. The rated output is measured under optimal conditions, and may not take lamp aging, misalignment, etc. into account. Note that the "throw" distance has nothing to do with the light required, unless it requires a less efficient lens. A gain screen would reduce the total light required, but would be more directional and should be properly curved for proper light distribution to the audience. ------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Eastman Kodak Company
Research Labs, Building 69, Room 7419
Rochester, New York, 14650-1922 USA
Tel: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243
E-Mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion
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