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Low Earth Orbit
Pro AV, Staging, & Rigging
Video projector suitable for outdoor use
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<blockquote data-quote="Rob Timmerman" data-source="post: 116705" data-attributes="member: 172"><p>Re: Video projector suitable for outdoor use</p><p></p><p><a href="http://tempest.org/products.php?lang=en&pid=1" target="_blank">Enclosures</a> are available to solve the outdoor aspect. The throw distance issue is simply a matter of using the appropriate lens. The bigger issue is one of brightness.</p><p></p><p>The rule of thumb for daylight (not direct sun) visibility is a screen intensity of 5000 nits (this makes some assumptions about required contrast ratio). Assuming a screen gain of .7 (white painted wall), this means that you need ~7k lumens per square foot of screen area. A 120" 4:3 screen is ~50 square feet, so you're well into the multiple-stack 20k+ lumen range. Well over $5k to purchase.</p><p></p><p>For comparison, computer screens are typically around 300 nits, so if that were sufficient brightness, an 18k projector would get you that level over your 120" screen. A 5k projector (about the max you'd be able to squeeze into your budget with lens and housing) would get you about that intensity over a 60" diagonal area (3'x4')</p></blockquote><p></p>
[QUOTE="Rob Timmerman, post: 116705, member: 172"] Re: Video projector suitable for outdoor use [url=http://tempest.org/products.php?lang=en&pid=1]Enclosures[/url] are available to solve the outdoor aspect. The throw distance issue is simply a matter of using the appropriate lens. The bigger issue is one of brightness. The rule of thumb for daylight (not direct sun) visibility is a screen intensity of 5000 nits (this makes some assumptions about required contrast ratio). Assuming a screen gain of .7 (white painted wall), this means that you need ~7k lumens per square foot of screen area. A 120" 4:3 screen is ~50 square feet, so you're well into the multiple-stack 20k+ lumen range. Well over $5k to purchase. For comparison, computer screens are typically around 300 nits, so if that were sufficient brightness, an 18k projector would get you that level over your 120" screen. A 5k projector (about the max you'd be able to squeeze into your budget with lens and housing) would get you about that intensity over a 60" diagonal area (3'x4') [/QUOTE]
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Video projector suitable for outdoor use
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