ViewSonic LS901-4K: Specs, Throw Distance & Alternatives
A 4K laser phosphor DLP projector aimed at home theater and installation use. ViewSonic rates it at 5,500 ANSI lumens, with a 1.7x zoom and vertical lens shift. It has no smart TV system and no built-in wireless, and ViewSonic lists 4.2 ms input lag without stating the mode.
Is the ViewSonic LS901-4K right for you?
Good for
- Bright rooms: 5,500 ANSI lumens rated
- Placement flexibility: a 1.7x zoom plus vertical lens shift
- HDR and HLG content
- Installations: RS-232 and RJ45 control, ceiling mounting and 360 degree operation
What to plan for
- No smart TV system and no built-in Wi-Fi or Bluetooth: add a streaming stick (the USB-A port supplies 5 V / 1.5 A)
- The 4.2 ms lag rating does not state its mode, and no 4K/60 lag figure is published
- Lens shift is vertical only, and the offset is high at 154% ±10%
- ViewSonic does not name HDR10 on its spec page
- Audio out is 3.5 mm only, with no ARC or eARC listed
Based on manufacturer specifications and published reviews (sources below). We don't do hands-on testing.
ViewSonic LS901-4K specs
| Resolution | 4K UHD (3840 × 2160, 0.65-inch DLP) |
|---|---|
| Brightness | 5,500 ANSI lumens (ViewSonic rating) |
| Display technology | DLP |
| Light source | Laser phosphor |
| Light source life | 20,000 hours |
| Contrast ratio | 3,000,000:1 (ViewSonic rating) |
| Throw ratio | 1.20-2.04:1 |
| Lens shift | Vertical 0% to −21% (offset 154% ±10%); no horizontal shift |
| Max refresh rate | 240 Hz |
| HDMI ports | 2 (HDMI 2.0) |
| Speakers | 30 W |
| Weight | 10.69 lb |
How far from the screen?
Lens-to-screen distance for a 16:9 image, calculated from its 1.20-2.04:1 throw ratio. The zoom lets you place it anywhere in the range.
| Screen | Closest | Farthest |
|---|---|---|
| 80″ | 7' 0" | 11' 10" |
| 100″ | 8' 9" | 14' 10" |
| 120″ | 10' 6" | 17' 9" |
| 150″ | 13' 1" | 22' 3" |
ViewSonic LS901-4K input lag by mode
| Signal | Input lag |
|---|---|
| Mode not stated (ViewSonic rating) | 4.2 ms |
Source: ViewSonic’s published rating; the mode is not stated and no independent measurement is listed. Because these are upper limits and not measurements, we don't rank it against other models. Compare measured and rated figures in the input lag database.
ViewSonic LS901-4K alternatives at a similar price
In-stock 4K projectors priced closest to it on Amazon today.
| Model | Price today | Amazon rating | Compare |
|---|---|---|---|
| ViewSonic LS901-4K (this one) | $1,918 | 4.3★ | — |
| Nebula X1 4K Projector by Anker | $1,899 | 4.4★ | — |
| XGIMI HORIZON 20 Pro 4K RGB Triple Laser Home Projector | $1,999 | 4.3★ | — |
| Optoma 4K400STx 4K Ultra HD High Brightness Short Throw DLP | $1,807 | 2.9★ | — |
| BenQ X3100i True 4K UHD 4LED Gaming Projector | $1,799 | 3.6★ | — |
Where it fits
ViewSonic LS901-4K FAQ
- How far from the screen should the ViewSonic LS901-4K be for a 100-inch image?
- Between 8' 9" and 14' 10" from lens to screen, depending on the zoom setting (throw ratio 1.20-2.04:1).
- What is the input lag of the ViewSonic LS901-4K?
- Mode not stated (ViewSonic rating): 4.2 ms. Source: ViewSonic’s published rating; the mode is not stated and no independent measurement is listed.
- Does the ViewSonic LS901-4K have lens shift?
- Yes, vertical only: 0% to −21%, on a 154% ±10% projection offset. It has no horizontal lens shift.
Sources
Price, stock and rating come from Amazon and update automatically (last checked Nov 14, 2026, 10:00 PM).
Disclosure: As an Amazon Associate we earn from qualifying purchases. We also participate in the eBay Partner Network. We may earn a commission when you click through an affiliate link and make a purchase, at no extra cost to you. Prices and availability shown are accurate as of the time posted but are subject to change. Any price and availability information displayed at the time of purchase will apply.