Robertson AV Guides
Classroom Display Planning: UST Projector vs Flat Panel
By Robertson AV ·
Most classroom upgrades come down to three options: an ultra short throw (UST) projector over the board, an interactive UST projector that adds touch, or a large interactive flat panel. This guide compares them using manufacturer spec figures, with an eye to rolling the same solution out across several rooms.
Why UST suits classrooms
A conventional projector sits mid-room and the teacher ends up in the beam. A UST unit mounts right above the board and projects at a steep angle, so the presenter blocks little of the image. The key figure is throw ratio, the lens-to-screen distance divided by image width. Lower numbers mean closer placement.
| Projector | Throw ratio | Image size | Resolution | Brightness |
|---|---|---|---|---|
| Epson PowerLite 725W | 0.28 – 0.37 | 65″ – 120″ (16:10) | 1280 x 800 (WXGA) | 4,000 lumens |
| Epson BrightLink 725Wi (interactive) | 0.28 – 0.37 | 65″ – 100″ (16:10) | 1280 x 800 (WXGA) | 4,000 lumens |
| Epson PowerLite 750F | 0.26 – 0.36 | 65″ – 120″ (16:9) | 1920 x 1080 | 3,600 lumens |
| Epson PowerLite 810E | 0.16 – 0.22 | 80″ – 160″ (16:9) | 1080p with 4K Enhancement | 5,000 lumens |
| ViewSonic LS810 | 0.241 | 80″ – 150″ | 1280 x 800 (WXGA) | 5,200 ANSI lumens |
The 810E is the extreme case: Epson lists 10.9 to 22.7 inches from the wall at wide zoom for an 80-inch-plus image, which helps in tight rooms and large lecture spaces.
Option 1: standard UST projector
A good fit when the room already has a whiteboard or screen and lessons run from a laptop or document camera. The PowerLite 725W is a 4,000-lumen laser model rated for up to 20,000 hours of laser life, with built-in wireless LAN, three HDMI inputs, RS-232C, wired LAN, a microphone input and a 16 W speaker. For finer text, spreadsheets or maps, the PowerLite 750F moves to full 1080p at 3,600 lumens (20,000 hours in Normal mode, up to 30,000 in Extended). Epson sells the UST wall mount (V12HA06A05) separately for the 750F, so include it in your parts list. For larger rooms the ViewSonic LS810 offers 5,200 ANSI lumens, an 80 to 150 inch image and a light source rated at 15,000 hours (Normal) or 20,000 (Eco).
Option 2: interactive UST projector
If students will write, drag and annotate at the board, the BrightLink 725Wi adds infrared interaction to the 725W’s brightness, resolution and throw ratio: dual-user pen, finger touch with up to 6 touch points, and up to 8 users with touch modules. Its listed image range is 65 to 100 inches, and it includes 802.11 b/g/n/ac wireless, three HDMI inputs and a 16 W speaker. Because touch happens on the projected image, settle the mounting position and board surface with your installer before ordering.
Option 3: interactive flat panel
There is no beam and no throw distance, and panels cope well with daylight.
- NEC MultiSync CB651Q-2: 65-inch 4K, infrared touch with up to 20 touch points, finger, glove or stylus (8 mm or larger), 4 mm thermal-tempered anti-glare glass, OPS slot, two 12 W speakers, rated for 12/7 operation.
- Samsung WA75D: 75-inch 4K with 40-point infrared touch and passive pen, Android 13, 8 GB RAM and 64 GB storage, front USB-C and HDMI, 802.1x enterprise network security.
- Samsung Flip 2 WM85R: 85-inch 4K with 4 simultaneous drawing points, passive pen, Wi-Fi with Miracast and an OPS connector.
The trade-off is size: panels here run 65 to 85 inches, against 100 to 160 inches for the UST projectors. Back-row readability on a 65-inch screen deserves a check.
Four questions to settle first
- Image size: 65 to 85 inches can suit a standard classroom; deeper rooms may need 100 inches or more.
- Interaction: if people will write on it, choose the BrightLink or a touch panel. If it mostly shows a laptop, a standard UST costs less.
- Ambient light: projected images wash out in strong daylight. The 810E and LS810 are the brightest here, and a flat panel generally copes better.
- Noise: Epson lists 26 dB (Quiet) and 36 dB (Normal) for the 725W, 725Wi and 750F, and 26/35 dB for the 810E. ViewSonic lists 28 dB in Eco for the LS810. Quiet modes reduce brightness.
Shortlist
- Laptop-driven lessons: Epson PowerLite 725W
- Student interaction: Epson BrightLink 725Wi
- Sharper text at 1080p: Epson PowerLite 750F
- Lecture room or very short distance: Epson PowerLite 810E
- Bright room, tablet-style touch: NEC CB651Q-2 or Samsung WA75D
Outfitting more than one room?
Standardizing on one model across rooms simplifies training and spares. Send us your room count, wall sizes and model preferences through the quote request page (we handle projects of 5+ units regularly), or use our contact page. You can also browse all projectors. Free ground shipping applies to RobertsonAV orders.
FAQ
What is a throw ratio?
Lens-to-screen distance divided by image width. At 0.28, the projector sits 0.28 ft away per foot of image width.
How do the 725W and 725Wi differ?
Same brightness (4,000 lumens), WXGA resolution and throw ratio. The 725Wi adds pen and finger interaction; the 725W lists a 120-inch maximum image against 100 inches.
How long does the laser last?
Epson rates the 725W, 725Wi and 750F at up to 20,000 hours, and the 750F and 810E up to 30,000 hours in Extended mode. The ViewSonic LS810 is rated 15,000 hours (Normal) and 20,000 (Eco).
Flat panel or interactive projector?
Neither wins everywhere. Panels handle bright rooms and feel like a tablet; interactive projectors give a much larger image and usually work on the board already in the room.
Is wireless built in?
The Epson 725W, 725Wi, 750F and 810E all list built-in wireless LAN, and the 810E also lists Miracast.