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Office Products

Presentation, AV, Projectors

Presentation, AV, Projectors Article

takes a video signal and projects the corresponding image on a projection screen using a lens system. All video projectors use a very bright light to project the image, and most modern ones can correct any curves, blurriness, and other inconsistencies through manual settings. Video projectors are widely used for conference room presentations, classroom training, and home theatre applications.

A video projector may also be built into a cabinet with a rear-projection screen (rear-projection TV, or RPTV) to form a single unified display device, now popular for .home theater. applications.

Common display resolutions for a portable projector include SVGA (800×00 pixels), XGA (1024×68 pixels), 720p (1280×20 pixels), and 1080p (1920×080 pixels).

The cost of a device is not only determined by its resolution, but also by its light output, acoustic noise output, contrast, and other characteristics. While most modern projectors provide sufficient light for a small screen at night or under controlled lighting such as in a basement with no windows, a projector with a higher light output (measured in lumens, abbreviated .lm.) is required for a larger screen or a room with a higher amount of ambient light. A rating of 1000 to 1500 ANSI lumens or lower is suitable for smaller screens with controlled lighting or low ambient light. Between 1500 and 3000 lm is suitable for medium-sized screens with some ambient light or dimmed light. Over 3000 lm is appropriate for very large screens in a large room with no lighting control (for example, a conference room). Projected image size is important; because the total amount of light does not change, as size increases, brightness decreases. Image sizes are typically measured in linear terms, diagonally, obscuring the fact that larger images require much more light (proportional to the image area, not just the length of a side). Increasing the diagonal measure of the image by 25 % reduces the image brightness by 35 per cent; an increase of 41 per cent reduces brightness by half.

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LOUD MINI MEGAPHONE ~ PORTABLE SIZED MEGA PHONE
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Eiki Overhead Projector 3860A with spare lamp & manual
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10W Megaphone / Bullhorn Music & Speaker Mic. -BULLHORN
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Sony DPA-300 A/V Digital Image/Sound Capture System
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MEGAPHONE 30 WATT W/ MICROPHONE ~ SPORTING BULL HORN
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10W Megaphone / Bullhorn Music & Speaker Mic. -BULLHORN
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Apollo AI-1000 Overhead Projector WORKS GREAT!
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3M Overhead Projector Model 9100
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MULT-IFUNCTION 3 N 1 LASER PEN W/ CASE NEW IN PACKAGE
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NEW ELECTRIC MOTORIZED PROJECTOR SCREEN 100" 16:9 NR!
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Portable briefcase display unit
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MEGAPHONE 30 WATT W/ MICROPHONE ~ SPORTING BULL HORN
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NEW MEGAPHONE 30 WATT SIREN MUSIC MIC BULLHORN SPEAKER
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NEW 30 WATT MEGAPHONE BULLHORN HORN SPEAKER SIREN MUSIC
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Document Camera Lumens DC80A
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NEW MEGAPHONE SIREN MUSIC MICROPHONE BULLHORN SPEAKER
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HIGHLAND PORTABLE OVERHEAD PROJECTOR 1610 HIGH END
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Apollo Horizon 2 Overhead Projector - NEW
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Hisonic 35 Watt PA System + 3 VHF Wireless Microphones
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InFocus systems LCD projection panel 550 & manual case
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CANON RE-350 VIDEO VISUALIZER PARTS AND REPAIR
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AOSOM 95" ELECTRIC PROJECTOR PROJECTION SCREEN-2.5GAIN
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NAME BADGE LABELS 3.375" X 2.33" LABEL :313806
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3M Overhead Projector 9060 installed lamp + spare
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3M 955 3800 Lumens High Quality Overhead Projector
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3M 5-088 Portable Projector
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NEW ELECTRIC MOTORIZED PROJECTOR SCREEN 106" 4:3 NR!
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NEW ELECTRIC MOTORIZED PROJECTOR SCREEN 106" 16:9 NR!
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NEW Draper AccuScreens Precision Mounts APM1024WTR F...
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30W Megaphone:Safety Siren:Music:Speaker Mic.- Bullhorn
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PINK RIBBON (CITY OF HOPE) EXPO DRY ERASE MARKERS 2pk
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BUHL 80 Overhead Projector *New Bulb* Great for Murals!
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NEW Draper 15-3/4" Extension 800303
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NEW Draper AccuScreens Precision Mounts APM3655WT Fl...
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NEW ELECTRIC MOTORIZED PROJECTOR SCREEN 84" 16:9 NR!
$149.99
AMX Axcent 3 Controller
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NEW ELECTRIC MOTORIZED PROJECTOR SCREEN 150" 16:9 NR!
$289.00
10W Megaphone / Bullhorn Music & Speaker Mic. -BULLHORN
$9.41
NAME BADGE LABELS 3.375" X 2.33" LABEL :313806
$14.28
NEW 30 WATT MEGAPHONE BULLHORN HORN SPEAKER SIREN MUSIC
$15.68
Minolta Mini 35 Vintage Rare Projector Works Great
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Lot of Tektrox Paper, Transparencies & Printer cleaner
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CANON RE-650N 8X VIDEO VISUALIZER
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NEW 3M Overhead projector 1711 - Overhead projector ...
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NEW Draper 8" Extension 800302
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AOSOM MANUAL WALL PROJECTOR PROJECTION SCREEN 96"X96"
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3M Overhead Projector 9200 lamp changer + spare lamp
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Reply IQ Fleetwood Wireless Audience Classroom Response
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Office Aluminum White Board Easel Tripod USA FREE SHIP
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3M 1706 Overhead Projector *NEW BULB* Great for Murals
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NEW Draper AccuScreens Precision Mounts APM3655WF Fl...
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NEW ELECTRIC MOTORIZED PROJECTOR SCREEN 84" 4:3 NR!
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NEC VT580
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Document Camera Lumens DC80A
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DUKANE 28A850 MAGNIVIEW PORT. OVERHEAD VIDEO PROJECTOR
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NEW! MEGAPHONE MUSIC SIREN MICROPHONE BULLHORN SPEAKER
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REFURB 3M Overhead Projector, model 9080 w/warranty
$139.95
REFURB 3M Overhead Projector w/warranty
$89.95
NEW (Lot of 3) Eiko DYS 600W 120V Lamps for OH/Lights
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BRAND NEW H.P. PREMIUM TRANSPARENCY FILM 50 COUNT.
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NEW Quartet High Gain High Contrast Projector Screen w/
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DA-LITE 84x84 PORTABLE TRIPOD PROJECTOR SCREEN NEW
$112.52
EXPO COMBO MAGNETIC DRY ERASE MEMO BOARD 23" x 36" NEW
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92" 16:9 HDTV Electric Motorized Screen Gray Fabric
$199.98
Elmo Overhead Projector HP-L355 + spare lamp & manual
$33.00
NEW Draper AccuScreens Precision Mounts APM2537WF Fl...
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3M Portable Overhead Projector 6200AGB
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NEW 3M Overhead projector 1780 - Overhead projector ...
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MEGAPHONE 30 WATT W/ MICROPHONE ~ SPORTING BULL HORN
$17.95
NEW Siig - Cyber 2S1P Plus PCI JJ-P21012-S6
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DA-LITE 70x70 HIGH GAIN (2.5) TRIPOD PROJECTOR SCREEN
$112.52
EXPO DRY ERASE MEMO BOARD LARGE COMBO 23" X 36" MINT!!
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CRESTRON MPS200 MULTIMEDIA PRESENTATION SYSTEM
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BOONE Self Setting Easel Portable Presentation Aid 6410
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50" Plasma ATA Case HEAVY DUTY 3/8" Ply - Carpet Lined
$269.00
APOLLO VENTRA 4000 ULTRA PORTABLE OVERHEAD PROJECTOR
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NEW 30 WATT MEGAPHONE BULLHORN HORN SPEAKER SIREN MUSIC
$15.68