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BenQ

BenQ LK835ST 4K UHD Laser Short-Throw Projector

Name: BenQ LK835ST 4K UHD Laser Short-Throw Projector
Brand: BenQ
SKU: 9H.JT577.13E
Price: 2374.80 GBP
Availability: InStock

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Manufacturer warranty

Installation services available

£2,374.80inc. VAT

£1,979.00 ex. VAT

In stock, dispatched within 2 working days

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Bought in the UK, backed in the UKWhy it matters →

In UK stock, ships from the UK
UK manufacturer warranty
UK-based engineers
No import duty or customs charges
GBP pricing, UK VAT invoices

Return within 14 days

Manufacturer warranty

Installation services available

Call 01342 580255

Key specifications

Number of colours1.07 billion colours

Native aspect ratio16:9

Screen size compatibility1524 - 3048 mm (60 - 120")

Contrast ratio (typical)3000000:1

Zoom capabilityYes

Keystone correction, vertical-30 - 30°

Keystone correction, horizontal-30 - 30°

Projection technologyDLP

All 69 specifications

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Description

4K Clarity for Immersive Visuals and Detail-filled Experiences

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Discover breathtaking clarity with 4K resolution, bringing intricate details and vibrant colours to life. LK835ST ensures precise alignment with its motorised zoom, 3D Keystone Correction, and curved screen warping, allowing for quick and easy setup. With the power of 4K resolution, it enhances the immersiveness of any content, making it perfect for educational, interactive, and entertainment setups.

Seamless Alignment and Sharp Focus from any Angle

Quick Focus

Remote, hot-key, or RS232 control snaps the picture into sharp focus in seconds.

Auto Screen Fit

Aligns the image to the screen in three guided steps, removing manual shift and keystone work.

*Note:

Auto Screen Fit supports 16:9, 16:10, 4:3, and 1:1 aspect ratios.

For non-standard aspect ratios, please view the video and adjust via graphic card settings.

Enclosure or screen border requires at least 2 inches of width.

20,000-Hour Lifespan with No Lamp Replacement

Guarantees up to 20,000 hours of maintenance-free operation, saving you money on lamp replacements and maintenance. Take advantage of the consistently impressive brightness for up to 30,000 hours under Eco Mode.

Call 01342 580255

Key features

Experience Detailed, Immersive Visuals in 4K Clarity

Discover breathtaking clarity with 4K resolution, bringing intricate details and vibrant colours to life. The LK835ST ensures precise alignment with its motorised zoom, 3D Keystone Correction, and curved screen warping, allowing for quick and easy setup. With the power of 4K resolution, it enhances the immersiveness of any content, making it perfect for educational, interactive, and entertainment setups.

Technical specifications

Choose a section to view its specifications.

Display (11)

Native aspect ratio: 16:9
Screen size compatibility: 1524 - 3048 mm (60 - 120")
Contrast ratio (typical): 3000000:1
Projector brightness: 4000 ANSI lumens
Supported graphics resolutions: 640 x 480 (VGA), 3840 x 2160
DisplayPorts quantity: 1
Resolution: 4K UHD (3840 x 2160)
Contrast Ratio: 3,000,000:1 (FOFO)
Aspect Ratio: 16:9
HDR Support: HDR10, HLG
Projector native resolution: 4K UHD (3840 x 2160)

Connectivity (10)

Supported video modes: 480i, 480p, 576i, 576p, 720p, 1080i, 1080p, 2160p
VGA (D-Sub) ports quantity: 0
HDMI ports quantity: 2
DVI port: No
Ethernet LAN: No
Wi-Fi: Yes
AC input voltage: 100 - 240 V
White Light Output: 4,000 ANSI lumens
Connectivity: 2 x HDMI 2.0b, USB-C (DisplayPort), 2 x USB-A, RS-232
HDMI version: 2.0b

Audio (6)

Built-in speaker(s): Yes
Number of built-in speakers: 1
PC Audio out: Yes
Audio: 1 x 10W speaker
Noise level (economic mode): 29 dB
Service life of light source (economic mode): 20000 h

Power & Physical (11)

Product colour: Black
Power consumption (max): 320 W
Power consumption (standby): 0.5 W
Power consumption (economy mode): 136 W
Width: 303.5 mm
Depth: 112.4 mm
Height: 234.5 mm
Power Consumption: 192W typical (110V)
Dimensions (W x D x H): 303.5 x 234.5 x 112.4 mm
Weight: 3.4 kg
Power consumption (typical): 192 W

General (31)

Number of colours: 1.07 billion colours
Zoom capability: Yes
Keystone correction, vertical: -30 - 30°
Keystone correction, horizontal: -30 - 30°
Projection technology: DLP
Light source type: Laser
Service life of light source: 20000 h
Focus: Motorized
Throw ratio: 0.69~0.83
Offset: 102.5%
Full HD: Yes
RMS rated power: 10 W
Composite video in: 0
Serial interface type: RS-232
Component video (YPbPr/YCbCr) in: 0
AC (power) in: Yes
Product type: Short throw projector
Cable lock slot type: Kensington
Cable lock slot: Yes
Power source: AC
Operating temperature (T-T): 0 - 40 °C
Remote control included: Yes
Cables included: AC
Projection Technology: Single-chip DLP
Light Source: Laser, 20,000 hours
Throw Ratio: 0.69 - 0.83:1
Zoom: 1.2x optical
Keystone Correction: 3D: vertical +/-30 degrees, horizontal +/-30 degrees, rotation +/-30 degrees
Noise Level: 32 dB typical / 29 dB eco
Noise level: 32 dB
Market positioning: Business and installation

Call 01342 580255

Throw distance guide

With its 0.69 to 0.83:1 throw ratio, here's how far the projector needs to sit from the screen for common 16:9 image sizes. Try our throw distance calculator for your exact room.

Try a size

100"

16:9 diagonal image

Image

2.21 m × 1.25 m

Lens position

1.5 m to 1.8 m

Side view: drag the projector to try its available lens positions

Position fits

Image size	Image dimensions	Lens distance range
60"	1.33 m × 0.75 m	0.9 m to 1.1 m
80"	1.77 m × 1.00 m	1.2 m to 1.5 m
100"	2.21 m × 1.25 m	1.5 m to 1.8 m
120"	2.66 m × 1.49 m	1.8 m to 2.2 m
150"	3.32 m × 1.87 m	2.3 m to 2.8 m

Planning from a real wall? Use the projector screen size calculator to upload a photo, preview the image to scale and find projectors that fit within your maximum available space. Replacing an existing projector? The projector replacement calculator checks whether this lens covers the ratio your current mount needs.

Distances are lens-to-screen, calculated from the manufacturer's stated throw ratio; allow for lens shift and mounting hardware. Always confirm against the manufacturer's installation guide before fixing mounts.

See it on your wall, to scale

Choose a picture size, then upload a wall photo, or scan the QR code and take it on your phone. We'll show the projected picture at its real size.

Picture size

100" 16:9 · 2.21 m × 1.25 m

On a computer, the QR code sends your phone photo straight back to this page.

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Complete your setup

Optional extras that fit this product. Tick anything you need and it joins the same basket — or add this product on its own from the buy box above.

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Video Conferencing

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Professional Installation

Want it installed by our AV experts? We offer professional on-site installation including mounting, cable management, and system configuration.

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Your Configuration

BenQ LK835ST 4K UHD Laser Short-Throw Projector × 1£2,374.80

Total£2,374.80

inc. VAT

Documents

BenQ LK835ST datasheet — BenQ published specifications (PDF)

Delivery & returns

Estimated delivery 15 Sept - 19 Sept. UK mainland delivery only. Some large or made-to-order items carry longer lead times, shown on the product page.

Unused items in original packaging can be returned within 14 days of delivery — see the returns policy for how business and consumer returns differ. Faulty items are covered under manufacturer warranty and by your statutory rights.

Full delivery & returns policy

Bought in the UK, backed in the UK

This item is in UK stock and ships to you from within the UK, so the order never crosses a customs border on its way to you.
The manufacturer warranty is honoured here in the UK. If something fails, you deal with us, not with an overseas seller in another time zone.
Our own UK-based engineers install, commission and support what we sell, and can attend site when a system needs hands on it.
Delivered within the UK mainland, so there is no import duty, customs charge or courier handling fee waiting for you on delivery.
Prices are in pounds sterling with proper UK VAT invoices, and purchase orders are accepted from approved education accounts: no currency conversion and no surprises at the door.

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Payment & security

Pay securely by card. Education customers can apply for a 30-day purchase order account.

Schools, colleges, sixth forms, universities and multi-academy trusts can order on invoice, with no card payment required. Purchase orders and credit terms are for education customers only.

All transactions are processed over an encrypted, secure checkout.

Purchase order & invoice terms