— LED Wall · Fine-pitch indoor
Unilumin UMiniIII 1.2 — cabinet grid & viewing distance
Problem. A 4 × 2.25 m indoor video wall needs a fine-pitch cabinet that stays crisp for viewers who won't stand back far — corporate lobbies, control rooms and boardrooms typically watch from inside 3 m. The sizing question is which cabinet grid actually fits the target wall and what native resolution that grid delivers before any content or mounting decision is made.
Answer. At 1.25 mm pixel pitch, the Unilumin UMiniIII 1.2 tiles this wall as a 7 × 7 cabinet grid, producing an actual built wall of 4.2 × 2.36 m — slightly larger than the 4 × 2.25 m target because whole cabinets don't divide evenly. Native resolution comes out to 3360 × 1890 (roughly 6.4 megapixels), with a closest comfortable seat set to 3 m.
02 / In depth
How this preset reads — the engineering view.
Pixel pitch is the number that decides everything else on this page. At 1.25 mm, the Unilumin UMiniIII 1.2's 600 × 337.5 mm cabinet maps to a 7 × 7 grid across a 4 × 2.25 m target wall, and the same 1.25 mm figure sets the optimal viewing band for video content at roughly 1.3-2.5 m (pitch × 1.0 to pitch × 2.0). Stand inside 1.3 m and the pixel structure starts to intrude; stand past 2.5 m and the fine pitch is doing more resolving power than the eye can use — the wall would still look clean, just over-specified for that distance.
600 nits is a controlled-indoor brightness figure — it reads comfortably under normal lobby, boardroom or control-room lighting but is not intended for a sunlit atrium or a window-facing wall. The cabinet is front-service and wall-mount, so there's no rear access requirement behind the wall, which matters for the mounting plan on a masonry or partition wall. At the preset's 7 × 7 grid, native resolution lands at 3360 × 1890 (~6.4 MP) — enough headroom for full-HD and near-4K source content without visible upscaling artefacts.
Drag the wall width and height in the calculator and watch the cabinet grid and native resolution recompute in real time. Because cabinets are whole units, the calculator snaps the grid to the nearest whole-cabinet count in each direction — so the actual built wall (here 4.2 × 2.36 m) will usually differ slightly from whatever target size you type in. That gap is normal and is worth flagging early in a project brief, not discovering after cabinets are ordered.
What the calculator does not decide: the structural and rigging load the wall imposes on the host wall or frame, the power and data cable-run plan back to the control room, the video processor or scaler that feeds the wall its signal, how source content resolution maps onto the native 3360 × 1890 canvas, and any ambient-light calibration the room may need. Those are downstream engineering and integration decisions that follow from — but are not answered by — the wall-size math.
What this preset deliberately does not solve
- The 7 × 7 grid and 4.2 × 2.36 m actual wall are cabinet-snapped figures — the calculator cannot produce a wall that exactly matches an arbitrary target size.
- 600 nits assumes a controlled indoor environment; it is not a brightness figure for daylight-facing or high-ambient-light installations.
- Viewing-band figures (1.3-2.5 m) are content-agnostic guidance for general video; text-heavy or data-dense content typically wants distances toward the far end of that band.
How this preset differs from its siblings
Other fine-pitch indoor LED products in the catalogue sit at coarser pitches or different service profiles, which shifts both the cabinet grid and the comfortable viewing distance for the same wall size — a coarser pitch pushes the optimal band further back and needs fewer, larger cabinets, while a front-service requirement (as here) versus a rear-service cabinet changes the mounting plan even at an identical pitch. This preset exists to answer the specific 1.25 mm, front-service, wall-mount combination at a 4 × 2.25 m target — the numbers won't transfer directly to a different pitch or a rear-service product line.
03 / Hydrated calculator
Try the configuration — live.
The calculator below is preloaded with this preset’s state. Adjust any input — your URL stays shareable.
— Calculator · LED wall size
The wall built cabinet by cabinet.
Pick a brand, model, wall dimensions and viewing distance. Cabinet count, native resolution, power, weight and feasibility flags resolve in real time. Sources cited.
Cabinets
49
7 across × 7 down
Native resolution
3360 × 1890
6.4 megapixels
Actual wall
4.20 m × 2.36 m
9.9 m² · cabinet-snap
A planning link — not a quote.
- model
- Unilumin UMini III 1.2 — P1.2
- pitch
- P1.25 mm
- brightness
- 600 nits
- refresh
- 3,840 Hz
- viewing
- 1.25 m – 2.50 m optimal
- weight
- 347 kg
- power
- avg 1.79 kW · peak 4.76 kW
Fine-pitch MiniLED with sub-millimetre uniformity. Common choice for trading floors, boardrooms and broadcast.
Indicative cabinet build for shortlisting — confirm structure, power and processing against a site survey before ordering.
What changes this estimate
- Actual viewing distances in the room
- Pixel pitch availability in the chosen series
- Content type (data, video, fine text)
- Mounting structure & cabinet dimensions
Feasibility
600 nit brightness suits dim/controlled-ambient broadcast studios. For lit rooms a 1200+ nit panel is more forgiving.
Cabinet grid resolves to 4.20 m × 2.36 m (target was 4.00 m × 2.25 m).
A planning link — not a quote.
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Brief us on the project — with this configuration.
Presets are a typology starting point. The brief wizard captures the room geometry, programme and constraints we need to translate this configuration into a real design.