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ViewSonic LS901-4K Projector

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SUMMARY: The ViewSonic LS901‑4K delivers high-resolution laser projection suited for venues and home theaters. Offering true 4K resolution with flexible installation options, it provides compelling visuals without overstating its performance. Real-world use may reveal lower brightness and contrast than stated, yet the unit remains reliable for detailed large-screen displays. Its long-lasting light source and robust connectivity support professional setups. While manufacturer claims around brightness and input lag warrant independent verification, the LS901‑4K is a solid choice for users needing authentic 4K projection in adaptable environments.

Best Used For: Home Theater, Gaming, and Golf Simulator

Released: 2025

Brand: ViewSonic

Specification	Details
Brightness	5500 ANSI Lumens (advertised)
Resolution	3840 × 2160 true 4K UHD (by 0.65" DMD chip)
Contrast Ratio	3000000:1 (dynamic, advertised)
Throw Ratio	1.2-2.04:1
Min/Max Throw Distance	1m–10.96 m (30″–300″)
Lamp Life	20000 hours (Normal), 30000 hours (Eco)
Connectivity	2× HDMI2.0/HDCP2.2, USB-A power, RJ45 LAN, RS232, audio out
Keystone Correction	H/V ±30°, 4‑corner adjustment
Zoom Lens	1.7× optical zoom & manual focus ring
Input Lag	~4.2 ms (claimed)
Audio Output	2×15 W speakers, audio out jack
Aspect Ratio	16:9/4:3
Weight (kg)	4.85 kg
Lens Shift	Vertical 0% to –21%
Controller Type	LAN control (Crestron, AMX, Extron, PJ Link), RS-232
Noise Level (dB)	~31 dB (Normal), ~25 dB (Eco)
Size of Projection	30″–300″ diagonal

Highlights

The ViewSonic LS901-4K Projector UHD Laser is positioned as a premium option for both high-end home theaters and commercial venues. Its impressive claim of 5,500 ANSI lumens brightness suggests superior image clarity even in bright, ambient-lit rooms; however, users should be cautious as independent sources like ProjectorCentral indicate this figure might be somewhat inflated, recommending verification before relying on this capability for brightly lit environments.

One of its standout features is the true 4K UHD resolution (3840 × 2160), confirmed across multiple reputable sources and backed by a genuine 0.65″ DMD chip. This ensures exceptional detail and vividness suitable for professional presentations, cinematic viewing, and detailed multimedia content, making it genuinely capable of delivering sharp, immersive visuals.

Another highly marketed feature, the dynamic contrast ratio of 3,000,000:1, is clearly manufacturer-calculated and thus should be treated with some skepticism. While contrast performance in practice is likely to be robust, users should anticipate more modest real-world outcomes, as verified independent tests are currently unavailable.

For versatile installation, the projector offers an optical zoom of 1.7×, which has been independently verified. This zoom capability, combined with a confirmed throw ratio of 1.2–2.04:1, provides considerable flexibility in projector placement, ensuring optimal image sizing and quality from various distances.

Confirmed projection distance ranges from 1 meter to a maximum of approximately 10.96 meters, delivering image sizes from 30″ up to an impressive 300″ diagonal. Users can reliably achieve a 100″ screen at approximately 3.32 meters, offering practical solutions for diverse spatial requirements.

Long-term usage is supported by a manufacturer-advertised laser light source lifespan of up to 30,000 hours in Eco mode (20,000 hours normal), consistently verified across retailer listings and manufacturer claims. This longevity ensures lower maintenance costs compared to traditional lamp-based projectors, offering cost-effective operation over years.

Connectivity options are robust, including confirmed dual HDMI 2.0 ports (HDCP 2.2), a USB-A power/service port, an RJ45 LAN port, an RS-232 control interface, and standard audio out jack. This broad connectivity suite ensures seamless integration into complex AV setups, supporting varied multimedia and control needs reliably.

Regarding image correction, verified sources confirm both Horizontal/Vertical Keystone correction of ±30° and precise 4-corner adjustment capabilities. These adjustments enable users to achieve perfectly aligned images even when projector placement isn’t ideal, significantly easing setup in challenging environments.

Gamers are likely intrigued by ViewSonic’s advertised input lag of approximately 4.2 ms. However, caution is advised as this remarkable figure has only surfaced via user claims on forums like Reddit and lacks comprehensive third-party verification. Serious gamers should verify performance independently before relying on this specification.

Audio capabilities are substantial for integrated sound, featuring confirmed dual built-in 15 W speakers totaling 30 W. While suitable for standard business presentations or casual viewing, these speakers are unlikely to match the immersive experience provided by external sound systems, and additional audio equipment is recommended for dedicated home theater environments.

Its native 16:9 aspect ratio with additional support for 21:9 ultra-wide formats has been confirmed. This versatility enables diverse content experiences, ideal for movies, gaming, and professional multimedia presentations.

Operationally, the projector’s confirmed noise levels are reasonable at around 31 dB in Normal mode and approximately 25 dB in Eco mode, indicating quiet enough performance suitable for home theater setups or professional environments without significant distraction.

The unit’s portability and ease of installation are confirmed, weighing approximately 4.85 kg, making it manageable for fixed ceiling mounts or occasional repositioning as necessary. Additionally, a verified vertical lens shift of 0% to -21% further aids precise projector alignment during setup.

Control and integration into sophisticated setups are further enhanced by confirmed compatibility with leading control systems like Crestron, AMX, Extron, and PJ Link via LAN and RS-232 interfaces, ensuring robust remote management capabilities.

Additional verified features include HDR10 and HLG support, reliable 360-degree projection capability, digital zoom, DLP Link 3D functionality, and sophisticated geometric correction. These collectively broaden its appeal across professional, educational, and home entertainment markets.

Overall, the ViewSonic LS901-4K Projector UHD Laser convincingly balances high-resolution image quality, installation flexibility, and robust connectivity, making it a strong choice for those needing dependable, professional-grade visual performance. Users should, however, approach manufacturer claims regarding brightness, contrast, and input lag with appropriate caution, relying on trusted independent evaluations for critical installations.

Amazon Price History

Date	Price (USD)
2025-07-08	1984.99
2025-07-11	1949.99
2025-07-14	2299.99
2025-08-09	2292.99
2025-08-17	2299.99
2025-09-01	0

Since 2025-07-11

Auto Product Comparison

Product	ViewSonic LS901-4K Projector	PANSEBA QK06 Projector	Magcubic HY300 Pro+ Mini Projector	ELEPHAS YG561 Projector
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Badges			Best Deal
Price	N/A at Amazon.com	$59.99 at Amazon.com	$59.99 ~~$109.99~~ at Amazon.com	$359.99 ~~$399.99~~ at Amazon.com
Brand	ViewSonic	PANSEBA	Magcubic	ELEPHAS
Check Details		Check Details	Check Details	Check Details
Brightness	5500 ANSI Lumens (advertised)	350 ANSI Lumens	260 ANSI lumens	1500 ANSI Lumens (advertised)
Resolution	3840 × 2160 true 4K UHD (by 0.65" DMD chip)	Native 1080P	Native 720P, downscales 4K input to 720P	Native 1080P, 4K Supported (downscale to 1080P)
Contrast Ratio	3000000:1 (dynamic, advertised)	~1000:1	10000:1 (advertised)	20000:1 (dynamic, advertised)
Throw Ratio	1.2-2.04:1	~1.52:1	0.9	not specified
Min/Max Throw Distance	1m–10.96 m (30″–300″)	~11ft for 100'' diagonal screen	1.2-4m (for 40-200 inch screen)	not specified
Lamp Life	20000 hours (Normal), 30000 hours (Eco)	~20000 hours	>50,000 hours	30000 hours
Connectivity	2× HDMI2.0/HDCP2.2, USB-A power, RJ45 LAN, RS232, audio out	HDMI, USB, SD card, Bluetooth 5.1, Wi-Fi	HDMI, USB, Headset jack, Dual WiFi6, BT5.0	HDMI, USB, RJ45, Bluetooth 5.2, Wi-Fi
Keystone Correction	H/V ±30°, 4‑corner adjustment	Vertical +/-15°	Auto vertical keystone correction	Auto 4P Keystone
Zoom Lens	1.7× optical zoom & manual focus ring	fixed	Digital zoom 50%-100%	fixed
Input Lag	~4.2 ms (claimed)	Not specified	Not specified	Not specified
Audio Output	2×15 W speakers, audio out jack	Built-in dual speakers, audio out jack	Built-in 5W HIFI speaker	2 x 15W + Dolby Audio
Aspect Ratio	16:9/4:3	16:9	4:3/16:9	16:9
Weight (kg)	4.85 kg	1.03 kg	0.7 kg	3.63 kg
Lens Shift	Vertical 0% to –21%	Not available	Not available	Not available
Controller Type	LAN control (Crestron, AMX, Extron, PJ Link), RS-232	Remote Control	Infrared remote control	Remote Control
Noise Level (dB)	~31 dB (Normal), ~25 dB (Eco)	~45 dB	25-30 dB	Not specified
Size of Projection	30″–300″ diagonal	Up to 300 inches	40-200 inches	Up to 337 cm wide (225 cm recommended)
Connectivity	2× HDMI2.0/HDCP2.2, USB-A power, RJ45 LAN, RS232, audio out	HDMI, USB, SD card, Bluetooth 5.1, Wi-Fi	HDMI, USB, Headset jack, Dual WiFi6, BT5.0	HDMI, USB, RJ45, Bluetooth 5.2, Wi-Fi