BenQ LH820ST bright 3,500-lumen Full HD UST laser projector for business and education
- 1,920 × 1,080 Resolution · 16:9
- 3,000,000:1 Contrast
- 3,500 ANSI lumens · 34/32 dB Light & noise
- UST · TR 0.33:1 Lens
- 4K input support Picture
- laser light source Light source
- wall mount included Setup
- 2D keystone correction Setup
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Description

BenQ LH820ST
- 3000,000:1Contrast
- 3,500ANSI lumens
- 0.33:1Throw ratio
- 3.5 mm jack · VGAOutputs
Overview
As an ultra short throw projector, the BenQ LH820ST is the ideal solution for educational institutions and meeting rooms where maximum image size at minimal distance is required. Its laser light source delivers low-maintenance performance and high operational reliability in everyday professional use. The combination of high light output and native Full HD resolution ensures detailed presentations even in brighter environments.
Benefits and special features
- Laser light source with up to 38,000 hours of life in ECO mode for minimal maintenance.
- Ultra short throw optics enable large projections from just a few centimetres away without casting shadows.
- Flexible image alignment thanks to 2D keystone correction (vertical and horizontal ±15 degrees).
- Supports 4K content via HDMI 2.0 (HDCP 2.2) for future-proof connectivity.
- Excellent legibility thanks to the high 3,000,000:1 contrast and a dedicated infographic mode.
- Fast readiness thanks to instant on/off laser technology.
Picture and sound quality
Based on DLP technology with a DMD chip, the BenQ LH820ST delivers a sharp Full HD image with 3,500 ANSI lumens. The impressive contrast ratio of 3,000,000:1 ensures deep blacks and excellent text sharpness in presentations. With 30-bit colour depth, the projector can display up to 1.07 billion colours for accurate colour reproduction.
For audio, a stereo system with two built-in 10 W speakers is provided, capable of filling medium-sized meeting rooms without external equipment. A separate 3.5 mm jack output and a microphone input are available for more advanced audio setups.
- 2 x HDMI 2.0b (HDCP 2.2)
- 1 x VGA (D-Sub 15-pin) input
- 1 x monitor output (D-Sub 15-pin)
- 1 x LAN (RJ45) for network control
- 1 x USB Type A (1.5 A power supply)
- 1 x RS232 (DB-9 pin)
- Audio in/out (3.5 mm jack), microphone input
Mounting and installation
The projector is designed for table placement or wall mounting. Thanks to the UST optics, there is no risk of glare for the presenter. Installation is made easier by 2D keystone correction, which compensates for distortion if the projector cannot be positioned exactly centred to the screen.
In the box: power cable (3.0 m), remote control with batteries, quick start guide and the WM04G4 wall mount.
Security features: the unit has a PIN lock and provision for a security cable (Kensington lock).
Note on distance planning: add 37.6 cm plus approx. 7–12 cm for plug/cable exit.
According to the manufacturer, this projector supports image sizes from 80 inches (177 cm) to 120 inches (266 cm).
| Image size (diagonal) | Image width (approx.) | Throw distance (approx.) |
|---|---|---|
| 80 inches | 177 cm | 58 cm |
| 100 inches | 221 cm | 73 cm |
| 120 inches | 265 cm | 88 cm |
The calculated throw distances are based on the manufacturer's throw ratio and are intended as guide values. As the measuring points (e.g. from the centre of the lens vs. the front of the housing) often vary between data sheets, calculations accurate to the centimetre cannot always be guaranteed.
Running and follow-up costs
Typical power consumption is 170 W in operation, dropping to under 0.5 W in standby. Thanks to the laser light source, there is no need for regular lamp replacements, which significantly reduces the total cost of ownership (TCO).
| Operating mode | Lifetime | 2 hrs/day | 8 hrs/day |
|---|---|---|---|
| Standard mode | 20,000 hrs | 27.5 years | 7.0 years |
| ECO mode | 38,000 hrs | 52.0 years | 13.0 years |
Conclusion
The BenQ LH820ST is a capable specialist for projection in tight spaces. With its long-lasting laser light source and high Full HD image quality, it offers an economically attractive solution for education and business. The included wall mount and flexible correction options round off this installation-friendly package.
From a single unit to a complete system: we plan your turnkey projector solution, including suitable accessories and integration. Get your individual package offer from our Beamer-Discount specialists – request it now!
Technical data
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General
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Condition
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Manufacturer
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Brand
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Model name
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Manufacturer part number
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EAN
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Product type
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Product series
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ApplicationEducation projector, Short-throw projector
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FeaturesIntegrated speaker
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Image
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Projector type
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Resolution
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Aspect ratio
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ANSI lumens
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Contrast ratio
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Light source
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Light source
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Lamp life
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Lamp life (Eco)
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Projection and lens
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Projection distanceUltra short throw
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Throw ratio0.33 : 1
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Lens included in deliveryYes
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Keystone correction horizontal
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Keystone correction vertical
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Connections and wireless
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Inputs1x 3.5 mm jack, 1x Ethernet, 1x RS232, 2x HDMI
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Outputs1x 3.5 mm jack, 1x VGA
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Wireless technologyn/a
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Energy and noise
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Operating noise
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Operating noise (Eco)
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Power consumption in operation
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Dimensions and weight
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Dimensions (W × H × D)31.7 × 20.8 × 37.6 cm
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Weight
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Colour
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Scope of delivery and warranty
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Scope of deliveryPower cable, Remote control
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Warranty
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Warranty type
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WEEE number
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Documents & downloads
Throw distance calculator – Optimal setup for BenQ LH820ST
Optimal setup for BenQ LH820ST
More settings
Aspect ratioLaser TV / ultra short throw: distance is measured from the light exit (slot on top of the device) to the screen. Best placed on a small table or low sideboard directly below the screen.
Borderlinebelow 500 lm/m²
Darkened roomfrom 500 lm/m²
Room with ambient lightfrom 1,000 lm/m²
Bright roomfrom 1,500 lm/m²
Borderline: at this image size the picture looks flat and low in contrast even in a darkened room – better to choose a smaller image.
Reviews
Product safety information
Manufacturer
BenQ
EU responsible person
BenQ Deutschland GmbHEssener Str. 5
46047 Oberhausen
Germany
Contact
E-Mail: info.de@benq.com










