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BenQ

BenQ TH685P Full HD 3,500-Lumen Gaming Projector

Name: BenQ TH685P Full HD 3,500-Lumen Gaming Projector
Brand: BenQ
SKU: 9H.JL877.14E
Price: 681.10 GBP
Availability: InStock

Return within 14 days

3-year manufacturer warranty

Installation services available

£681.10inc. VAT

£567.58 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

3-year manufacturer warranty

Installation services available

Key specifications

Brightness3500 ANSI lumens

Light Source LifeUp to 15,000 hrs (LampSave)

Zoom Ratio1.3x

Native Aspect Ratio16:9

Rec. 709 Coverage95%

Input Lag4.2 ms (1080p 240Hz)

HDMI Inputs2 x HDMI 2.0b

Speaker5W

All 26 specifications

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Description

The BenQ TH685P pairs Full HD DLP imaging with 3,500 ANSI lumens of brightness, giving a bright, high-contrast picture that holds up in daylight-lit living rooms. Projector-optimised HDR10 and HLG support let it downscale 4K HDR Blu-ray and streaming sources for richer contrast and colour on a big screen.

Also in this range:5,500-Lumen 4,600-Lumen 4,000-Lumen 5,000-Lumen Full specifications Datasheet Compare alternatives

Gaming is a strong focus: input lag drops as low as 8.3ms at 1080p/120Hz and 4.2ms at 240Hz, giving fast-paced titles the responsiveness they need. Dual HDMI inputs, 1.3x zoom and auto vertical keystone correction make it easy to connect consoles, streaming boxes and a laptop simultaneously and get an aligned image quickly.

A lamp light source rated up to 15,000 hours in LampSave mode, a 5W built-in speaker and support for 3D content round out a versatile all-purpose projector for family movie nights and competitive gaming alike.

Key features

3,500 ANSI Lumens

Bright DLP image quality suitable for daylight and ambient-light rooms.

Ultra-Low Input Lag

As fast as 4.2ms at 1080p/240Hz for competitive, responsive gaming.

HDR10 & HLG Support

Downscales 4K HDR content from Blu-ray and streaming for richer contrast and colour.

Flexible Connectivity

Dual HDMI inputs plus 1.3x zoom and auto keystone for quick multi-device setup.

Technical specifications

Choose a section to view its specifications.

Display (6)

Brightness: 3500 ANSI lumens
Native Aspect Ratio: 16:9
Resolution: Full HD (1920 x 1080)
Contrast Ratio: 10,000:1 (FOFO)
Aspect Ratio: 16:9
HDR Support: HDR, HLG

Connectivity (4)

Input Lag: 4.2 ms (1080p 240Hz)
HDMI Inputs: 2 x HDMI 2.0b
White Light Output: 3,500 ANSI lumens
Connectivity: 2 x HDMI 2.0b, USB-A, RS-232, 3.5 mm audio in and out

Audio (2)

Speaker: 5W
Audio: 1 x 5W chamber speaker

Power & Physical (4)

Dimensions: 312 x 110 x 225 mm
Power Consumption: 297W typical (110V)
Dimensions (W x D x H): 312 x 225 x 110 mm
Weight: 2.79 kg

General (10)

Light Source Life: Up to 15,000 hrs (LampSave)
Zoom Ratio: 1.3x
Rec. 709 Coverage: 95%
Picture Modes: 3D, Bright, Cinema, Game, HDR, HLG, Sports and more
Projection Technology: Single-chip DLP
Light Source: Lamp, 4,000 hours normal / 10,000 hours eco / 15,000 hours LampSave
Throw Ratio: 1.13 - 1.46:1
Zoom: 1.3x optical
Keystone Correction: 1D auto: vertical +/-40 degrees
Noise Level: 35 dB typical / 29 dB eco

Throw distance guide

With its 1.13 to 1.46:1 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

2.5 m to 3.2 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	1.5 m to 1.9 m
80"	1.77 m × 1.00 m	2.0 m to 2.6 m
100"	2.21 m × 1.25 m	2.5 m to 3.2 m
120"	2.66 m × 1.49 m	3.0 m to 3.9 m
150"	3.32 m × 1.87 m	3.8 m to 4.8 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

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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 TH685P Full HD 3,500-Lumen Gaming Projector × 1£681.10

Total£681.10

inc. VAT

Documents

BenQ TH685P datasheet (PDF)

Frequently asked questions

How bright is the TH685P and what's it best suited to?

It delivers 3,500 ANSI lumens at Full HD (1080p) resolution, giving a bright, high-contrast picture that holds up well in daylight-lit living rooms rather than needing full blackout.

How far from the screen should the TH685P sit?

With a 1.127-1.46 throw ratio and 1.3x zoom, for a 100-inch 16:9 screen it needs to sit roughly 2.49m to 3.23m back, with automatic vertical keystone correction (±40°) to help square up the image.

Is it suitable for gaming as well as movies?

Yes - it supports up to 240Hz with an input lag as low as 4.2ms at 1080p/240Hz, and includes a dedicated Game picture mode alongside Cinema, HDR, HLG, Sports and other presets.

Does it support HDR content?

Yes, it supports HDR10 and HLG, letting it downscale 4K HDR Blu-ray and streaming sources for richer contrast and colour on the big screen.

How long does the lamp last?

The lamp is rated for up to 15,000 hours in LampSave mode.

What warranty and delivery apply?

The TH685P comes with a 3-year (36-month) warranty. It's in stock at TopAV, so orders dispatch within 2 working days, with free UK delivery on orders over £100 (£9.95 below that).

Delivery & returns

Estimated delivery 18 Sept - 22 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.

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