Events & XR stages — production design with LED

The Architecture of Immersion: LED as the Backbone of Modern Stagings

The era of two-dimensional projections in the event sector has come to an end. Where static backgrounds or simple mapping processes once dominated, Extended Reality (XR) and Virtual Production now define the limits of technical possibility. An XR stage is not merely a collection of LED modules; it is a highly complex ecosystem in which graphics processing power, tracking systems, and signal processing must be synchronised in real-time. The goal is clear: the boundary between physical set construction and digital content must be invisible to the human eye and, even more critically, to the eye of the camera.

Events today are increasingly designed for digital audiences. Whether it is a keynote, a hybrid specialist conference, or a broadcast production – the quality of the visual infrastructure determines the credibility of the brand. We are observing a shift away from pure decoration towards functional production design that allows for real-time interaction. When a speaker stands in front of a 12-metre-wide LED wall and changes data visualisations in space via gesture, this is the result of precise engineering work.

The Technical Foundation: Pixels, Processors, and Light Output

At the heart of every XR stage is the LED volume. Usually, two different module types are used: high-resolution backwalls and high-brightness ceiling panels (ceiling LEDs) for realistic reflections on surfaces. For high-end productions, a pixel pitch of 2.6 mm down to 1.5 mm is the benchmark today. Brands such as Absen (particularly the Polaris series for rental or the AX series) and Alfalite with the Modularpix range set standards in colour fidelity and mechanical precision.

However, it is not just the pitch that determines camera suitability, but the electronics in the background. Processors such as the Brompton Tessera SX40 or the NovaStar MX40 Pro are the brain of the system. They do not just process the image signal, but correct colour spaces down to the deepest grey values. A critical value here is the refresh rate: while standard displays often operate at 1,920 Hz or 3,840 Hz, professional XR environments require at least 7,680 Hz to ensure no flickering or scan lines occur during fast camera movements and at high shutter speeds.

In-Camera VFX (ICVFX) and Tracking

One of the greatest advantages of modern LED infrastructure over classic greenscreens is In-Camera VFX. The actor sees their surroundings, which improves performance, and the camera captures the final image including the correct lighting mood and reflections directly (Final Pixel). This massively reduces post-production costs. For this to work, the camera's position in space must be tracked with millimetre precision. Systems such as OptiTrack or Ncam deliver this data to the render nodes – usually powerful workstations with NVIDIA RTX A6000 or 6000 Ada generation GPUs – which calculate the background of the LED wall with correct perspective in Unreal Engine 5.

Deep-Dive: The Components of an XR Infrastructure

To understand the technical effort behind a stable XR stage, it helps to look at the required standards and interfaces. This is not about consumer electronics, but industrial reliability.

Colour Accuracy and HDR Workflows

An often underestimated aspect is compliance with industry standards such as Rec. 709 or DCI-P3. In professional environments, work is increasingly carried out in HDR (High Dynamic Range). Here, peak brightness is decisive so that bright light sources in digital content (e.g. a sun or spotlights) illuminate the scene physically correctly. Modern LED modules achieve values between 1,000 and 1,500 nits here, which is more than sufficient for indoor applications to ensure a high contrast range.

Mechanics and Thermal Management

LED walls in XR stages are often under continuous load. Standards such as EN 60598 for electrical safety and specific fire protection classes apply here. Especially in temporary setups at events, weight plays a role. Aluminium constructions must be statically tested, while the heat dissipation of the LED modules (thermal management) must ensure that no colour drift occurs due to overheating. High-quality modules use passive cooling design to avoid creating disturbing fan noise in the studio.

Practical Example: Corporate HQ Broadcast Studio

A leading technology company in Vienna has transformed its central auditorium into a permanent XR studio. The goal was the production of quarterly stakeholder updates and global product launches.

The Setting:

• Location: Corporate Headquarter, indoor auditorium.
• Hardware: A concavely curved LED wall (8 x 4 metres) made of Absen AX 1.5 modules. A pixel pitch of 1.5mm allows camera distances of less than two metres without pixel structures becoming visible.
• Processing Power: 3 dedicated render nodes for Unreal Engine, synchronised via Genlock.
• Special Feature: Integration of smart glass elements on the sides, which can switch from opaque to transparent as required to include the real architecture of the building in the show.

By using Brompton Tessera processors, so-called "ShutterSync" technology could be used. This adjusts the refresh rate of the LED wall exactly to the shutter of the camera system (Sony Venice 2). The result is artefact-free images that cannot be distinguished from real set construction in terms of broadcast quality.

Challenges in Planning XR Events

It would be naive to believe that you can set up LED panels and immediately have a functioning XR environment. The biggest hurdle is latency (delay). When the camera moves, the digital image in the background must follow in milliseconds. If this latency exceeds a cumulative value of about 2-3 frames, the illusion collapses for the viewer. This requires a precisely coordinated hardware chain.

Another issue is moiré patterning. This occurs when the grid of the camera pixels interferes with the grid of the LED diodes. This can only be controlled by three factors: a fine pixel pitch, precise focusing of the lens (often a slight soft focus is chosen for the background), and the use of optical low-pass filters in the cameras.

What We See in Practice

1. Trend towards fixed installation: More and more companies are investing in their own studios instead of rental to shorten content cycles (keyword: Agile Content Production).
2. Software-centricity: The choice of engine (Unreal Engine 5.4/5.5) determines the hardware requirements. Hardware is increasingly planned around the software workflow.
3. Sustainability through virtuality: XR massively reduces the need for speakers to travel. They can be digitally "teleported" into an environment (holoportation), which reduces emissions and supports compliance with CSRD guidelines.
4. Rising requirements for technicians: The job profile of the classic event technician is changing into a system engineer with deep knowledge in network technology, 3D rendering, and colorimetry.
5. Accessibility & Standards: The implementation of the Accessibility Strengthening Act (BFSG 2025) also requires clear contrasts in digital spaces and the possibility of displaying supporting elements (sign language avatars), which can be optimally implemented on LED infrastructures.

Regulatory Aspects and Efficiency

In the European Union, Regulation EU 2021/341 (Ecodesign requirements) applies to the installed components. This regulates, among other things, the energy efficiency of displays. Lumexo ensures when selecting hardware that modules have minimal consumption in standby mode and that power supply units achieve an efficiency of over 90%. This is not just a matter of certification, but a massive cost factor in operational performance for large-scale LED installations.

Additionally, fire protection specifications (e.g. EN 13501-1) must be strictly observed, especially when wooden platform constructions are combined with electronic components. We recommend the use of certified subconstructions and low-smoke cable materials (LSZH).

Recommendation from Lumexo

Based on our experience in planning and integrating complex visual infrastructures, we advise the following approach:

• Quality over Quantity: It is better to invest in a smaller area with excellent pixel pitch (≤ 1.9mm) and high-end processing (Brompton/NovaStar COEX) than in a huge wall with inferior control. The camera does not forgive weaknesses in the greyscale range.
• Think Infrastructure First: Plan for 10G network structures and redundant power supplies. An XR stage is only as stable as its weakest cable.
• Test under Real Conditions: Conduct camera-based tests (camera shootouts) before final installation with the exact equipment that will be used later in live operation. Every camera sensor behaves uniquely in interaction with LED diodes.
• Future-proofing through Modularity: Choose LED systems that are mechanically compatible with successor models to avoid having to replace the entire system during future expansions.