BenQ LH655C 4,000 lumens Full HD laser projector for meeting rooms

BenQ LH655C – Full HD laser projector with 4,000 lumens for meeting and training rooms

The BenQ LH655C is a compact Full HD laser projector with 4,000 ANSI lumens for meeting, conference and training rooms. The 16:9 image at 1,920 × 1,080 is equally suited to presentations and Full HD video. The low-maintenance light source runs for up to 20,000 hours, two HDMI inputs keep the presentation PC and video conferencing system permanently connected, and the serial RS-232 interface integrates the projector into room control systems.

Key benefits at a glance

• 4,000 ANSI lumens in Full HD: slides, spreadsheets and videos remain clearly visible in 16:9 format even with the room lights on.
• Low-maintenance light source: 20,000 hours in normal mode, up to 30,000 hours in Eco mode, service-free in continuous operation.
• Two HDMI inputs: presentation PC and video conferencing system stay permanently cabled at the same time – no replugging when switching sources.
• RS-232 control: integrates the projector into media control systems via a serial interface and allows central operation without a network on the projector.
• Quick alignment: automatic keystone correction (±40° vertical and horizontal) and 4-corner adjustment compensate for image geometry when the mounting position is not exactly at the centre of the screen.
• Wall colour correction: electronically compensates for coloured projection surfaces and delivers neutral colour reproduction even on yellow, green or blue walls.

Is the BenQ LH655C the right choice?

• Yes, for classic meeting, conference and training rooms up to around 150 inches that need a bright Full HD image in 16:9 for presentations and video from a standard distance, and where the projector should run with low maintenance in continuous operation.
• Not ideal if central network remote management via LAN is mandatory: the LH655C is controlled via the serial RS-232 interface and has no LAN port. If you need management over the IP network, choose a model with a LAN port from our installation projectors.
• Not suitable for true 4K detail, for example with high-resolution CAD drawings – you will find suitable devices under 4K projectors.

For a rich image in daylight, we recommend an ambient light rejecting or high-contrast screen, mounted on a suitable ceiling mount.

Unsure about room size or the number of image sources? Get in touch →

Applications: what the BenQ LH655C is ideal for

Meeting and conference rooms
With 4,000 ANSI lumens and Full HD resolution, the image remains legible even with the ceiling lights on – slides, spreadsheets and graphics are clearly visible at a 100-inch screen size (approx. 2.21 m wide). The 16:9 format reproduces presentation slides and Full HD video full-screen, without black bars. With the direct power-on function, the projector starts as soon as mains power is applied; signal power-on wakes it from standby as soon as a notebook connects via HDMI.

Training and seminar rooms
In training use, the LH655C starts immediately after switching on without a warm-up phase. Your own company logo can be stored as the start-up image, and password protection secures the device against unauthorised use.

Flexible presentation use
Weighing 3.0 kg and measuring 279 × 225 × 121 mm, the LH655C can be moved quickly – from the conference table to the seminar room, from the office to a sales appointment. Auto keystone correction saves setup time when moving, and the light source needs neither warm-up time nor lamp changes.

Picture quality of the BenQ LH655C

The 0.65" DLP chip works together with the light source to reach 4,000 ANSI lumens at full brightness. In business use, the dynamic contrast ratio of 3,000,000:1 helps above all with fine lines, spreadsheets and dark chart areas. DLP technology renders a sharp pixel structure, which visibly helps with text slides, diagrams and spreadsheets. In 16:9, Full HD video fills the screen – relevant for training videos and video conferences.

Eco mode lowers the laser output with dark image content, reducing power consumption and noise down to 31 dB(A). In training rooms where quiet is important, this makes a noticeable difference.

Connections

Connections at a glance:

HDMI 1.4a, 2×

Two digital image inputs for presentation PCs, notebooks or video conferencing systems. Two fixed sources stay cabled at the same time and are switched via source selection. High Speed HDMI is sufficient for Full HD even with ceiling mounting. Only from a cable length of approx. 15 m does an active or optical HDMI cable make sense.

USB Type A, 2×

For firmware updates and powering small devices. The service port supplies 5 V / 1.5 A.

RS-232

Serial control interface for integration into room control systems. Power on/off, source selection, volume and status queries can be addressed centrally, without a network on the projector.

Audio out, 3.5 mm jack

Passes the audio signal on to external speakers or a PA system. The integrated 15 W mono speaker provides basic sound – if speech intelligibility matters to you, add an external system via this output.

Security Kensington lock + PIN

Mechanical theft protection and password protection for seminar and conference rooms with changing audiences.

Note on wireless presentation: The LH655C has no built-in Wi-Fi. You can add wireless casting with an HDMI casting receiver plugged into an HDMI input – you will find a specific recommendation in the accessories section.

Light source & operation

Mounting & installation

The BenQ LH655C is suitable for table placement and ceiling mounting; the ceiling fixing uses M4 screws.

The lens has a fixed offset. When ceiling-mounted, the projector hangs upside down; position the mount so that the centre of the screen and the centre of the lens are at the same height. If a small residual offset remains, it is compensated by automatic keystone correction (±40° vertical and horizontal) or 4-corner adjustment. In fixed installations, it pays to carefully align the mount position with the screen axis before correcting digitally.

Suitable projector ceiling mounts and projector ceiling lifts for the LH655C are available in our shop.

Throw distance (screen size 16:9, TR 1.48–1.62:1):

The projector measures 279 × 225 × 121 mm and weighs 3.0 kg. Allow an additional approx. 7 to 10 cm for plug and cable exits.

In the box

• BenQ LH655C projector
• Quick start guide
• Remote control (RCA011) with 2 × AAA batteries
• Power supply and power cable
• Warranty card

BenQ LH655C vs. BenQ LH650 vs. Acer XL2530 – which Full HD laser projector suits your room?

The LH655C is the standard-throw projector for classic meeting rooms: 4,000 ANSI lumens in Full HD and two HDMI 1.4a inputs for two fixed sources. If you want the same 4,000-lumen class but also need a USB-C single-cable connection for BYOD laptops and a shorter throw distance, choose the BenQ LH650; if you are looking for more light reserve for large or bright rooms, choose the Acer XL2530 with 4,800 ANSI lumens at an identical throw distance.

Have you thought of everything?

• Screen: For bright rooms with daylight, we recommend ambient light rejecting and high-contrast screens; for darkened training and conference rooms, all you need is a standard motorised screen.
• Mount: Suitable ceiling mounts for standard installations and projector ceiling lifts for discreet permanent installations are available directly in our shop.
• HDMI cable: Suitable High Speed cables for connecting the projector can be found under HDMI cables.
• Sound: The integrated 15 W mono speaker provides basic sound. For rooms where speech intelligibility matters, we recommend the celexon active speaker set via the 3.5 mm audio output.
• Wireless presentation: A receiver for wireless presentation plugs into the HDMI input and enables wireless casting from a laptop or smartphone.

Frequently asked questions about the BenQ LH655C

How can guests present wirelessly?
Via a casting receiver: a system for wireless presentation plugs into the HDMI input, and guests can then share their screen without any IT configuration on the projector.

Can I leave two sources permanently connected?
Yes. The LH655C has two HDMI 1.4a inputs – for example, a desktop computer and a conferencing system stay cabled at the same time, and you switch between them via source selection.

Is Full HD enough or do I need 4K?
For presentations and Full HD video in 16:9, Full HD resolution is sufficient. Only if you show high-resolution CAD drawings or 4K detail content in native resolution should you choose a 4K model.

How often does the light source need maintenance?
Never – the light source is maintenance-free and lamp changes are eliminated entirely (for service life, see the table "Light source & operation").

How can I control the LH655C centrally without a network connection?
Via the RS-232 interface, it integrates into room control systems – without a LAN port, which in fixed installations is often even the more stable route.

Conclusion: BenQ LH655C – low-maintenance Full HD presentation projector for conferences and training

For companies that want to equip meeting and training rooms in a standardised, low-maintenance way and integrate the projector into room control via RS-232, the LH655C is the right choice – bright in everyday presentations and reliable in continuous operation. We plan your room equipment from the screen to the mount. Request an individual offer now →