A 4m × 3m LED screen on typical event content draws roughly 3–4 kW — comfortably within a single 32A supply. That single figure resolves most of the anxiety around led screen power requirements, but it only holds if you confirm the right supply type, in the right place, with enough headroom for the screen and the rest of production. This guide covers the practical numbers, the trade-offs behind them, and the questions we ask before a screen leaves our warehouse.
Key takeaways
- A typical rental LED panel draws between 400W and 600W per square metre at full white, but real event content rarely hits that peak.
- Average content (mixed graphics, video, text on dark backgrounds) typically runs at 40–60% of maximum rated draw.
- A 4m × 3m screen on normal event content draws roughly 3–4 kW — comfortably within a single 32A supply.
- Always confirm available supply at the venue before specifying screen size. A 16A domestic socket tops out at around 3.6 kW.
- Cable length, voltage drop, supply location and other production loads can matter as much as the screen wattage itself.
- Generators need 25–30% headroom above peak draw to handle inrush current on startup.
- Enter your venue dimensions into our LED screen hire power planning to see these figures for your specific setup.
At a glance — power draw by screen size
| Screen size | Pixel pitch | Approx. area | Max draw (full white) | Typical draw (event content) | Minimum supply |
|---|---|---|---|---|---|
| 3m × 2m | P2.6 | 6 m² | ~2.4 kW | ~1.2 kW | 16A single phase |
| 4m × 3m | P3.9 | 12 m² | ~5.4 kW | ~2.7 kW | 32A single phase |
| 6m × 3m | P3.9 | 18 m² | ~8.1 kW | ~4.0 kW | 32A single phase |
| 8m × 4m | P3.9 | 32 m² | ~14.4 kW | ~7.2 kW | 63A single phase |
| 12m × 4m | P4.8 | 48 m² | ~19.2 kW | ~9.6 kW | 63A three phase |
Figures based on Dynamo DRE series rental panels (500mm × 500mm cabinets, integrated PSU) at typical outdoor brightness. Indoor brightness settings reduce draw by roughly 30–40%.
Enter your venue dimensions into our event LED screen hire to see these figures for your specific setup.
How much power does an LED screen use?
The headline spec on any LED panel datasheet is its maximum power consumption — the figure you see when every single pixel fires at full white, full brightness. For our DRE rental panels, that sits between 400W and 550W per square metre depending on pitch and configuration.
But events rarely run full-white content. A corporate keynote with dark backgrounds and text overlays might average 30% of maximum. A festival stage with full-colour video content might hit 50–60%. The gap between rated maximum and real-world average is significant, and it is the reason a 12 m² screen does not necessarily need a 63A supply.
That said, you always plan for peak, not average. Content changes — a sudden white flash during a video, a bright logo reveal, a last-minute slide deck with a white background — and the power supply needs to handle those spikes without tripping protection.
The practical rule we use: take the panel’s rated maximum draw, multiply by the screen area in square metres, then add 15% for the processor, cabling losses, and any peripherals (cameras, laptops, sound desks sharing the same supply). That gives you the figure to match against the venue’s available circuits.
For a standard LED screen hire at a conference or awards ceremony — typically a 4m × 3m P2.6 or P3.9 screen indoors — the total system draw including processor and backup usually lands between 2.5 kW and 4 kW. That is well within a 32A single-phase supply, which delivers roughly 7.2 kW at 230V.
Does brightness affect LED screen power consumption?
Yes. Outdoor LED screens running at 5,000–7,000 nits draw two to three times more power than the same screen indoors at 1,000–1,500 nits. This is why an indoor 20 m² screen and an outdoor 20 m² screen should not be treated as the same electrical problem.
Brightness depends on ambient light, viewing distance and how the screen is being used — IMAG, slides, sponsor loops. Camera exposure and content colour balance play in too. A screen showing mostly dark content may draw less power, but we do not base the electrical design on a creative promise alone. Content changes. A sponsor may send a bright white holding slide. A camera director may ask for more brightness after seeing the screen on camera.
The safer approach is to set a sensible operating brightness, estimate the real running load, then keep enough supply headroom for expected peaks.
Venue power supply: what to check before load-in
Not all venues are equal when it comes to available power. A purpose-built conference centre will have 63A or three-phase distribution boards accessible from the event floor. A heritage marquee site might have a single 32A commando socket on the far side of a field.
Here is what to confirm during your site survey or technical advance:
Available supply type and rating. Ask the venue for the rating of the nearest distribution board to your screen position. You need to know whether it is 16A, 32A, or 63A, and whether it is single-phase or three-phase. If the venue can only offer 13A domestic sockets, you are limited to very small screens or you will need a generator.
Distance from the distribution board to screen position. Voltage drop over long cable runs is a real consideration. A 50-metre run on undersized cable can drop below 215V, which triggers the panel PSU’s undervoltage lockout and the screen goes black. For runs over 30 metres, we typically step up the cable gauge or bring a local distro board.
What else is on the same circuit. If the venue’s catering, lighting rig, and your LED screen are all drawing from the same board, you need the total load figure — not just your screen’s draw. Several 13A sockets in a wall do not automatically mean several independent circuits. They may be on the same ring, or already shared with catering, laptops, uplighters or AV equipment. Ask the venue for a load schedule or, at minimum, confirmation that your required supply is dedicated.
Earth leakage protection. Modern venues should have RCD protection on power circuits. For outdoor events, 30mA RCD protection is a requirement under BS 7909. If the venue cannot confirm this, bring your own RCD-protected distro board.
Access route for cabling. Confirm whether cable runs cross fire exits, public walkways or vehicle routes. A 32A supply in the wrong room, behind a locked riser or across a public entrance may be less useful than a smaller supply in the right place.
If the venue has a house electrician or appointed electrical contractor, involve them early. They will know the venue’s distribution better than anyone.
We always carry out a technical site visit or request a detailed power plan from the venue before confirming any screen hire over 10 m². It adds a step to the planning process but it removes almost all of the power-related surprises on event day.
Generator hire vs venue mains: when each makes sense
For indoor conferences, exhibitions, and corporate events in established venues, mains power is almost always sufficient and preferred. It is more stable, quieter, and one fewer thing to coordinate. Our Audemars Piguet screen hire at Harrods is a good example of a fixed-venue install where the in-house supply carried the screen without a generator.
Generators come into play in three situations:
The venue has no fixed supply — greenfield festival sites, open parkland, car parks used for outdoor screenings.
The venue supply is too low — some older buildings, churches, listed venues, and rural marquee sites simply cannot deliver 32A or above from a convenient location.
You need power isolation — broadcast-grade events sometimes require a clean, isolated supply to prevent interference. A dedicated generator with a sine-wave inverter gives you that.
When sizing a generator, the critical rule is headroom. LED screens have inrush current on startup — the momentary spike as all the power supplies inside each cabinet charge their capacitors simultaneously. A generator rated too close to the steady-state load will trip on that inrush. We specify generators at 125–130% of the calculated peak draw, minimum. For a system with a 10 kW peak, that means a 13 kVA generator.
Fuel consumption is the other planning factor. A 20 kVA diesel generator running at 50–60% load will burn roughly 3–4 litres per hour. For a 12-hour event day including setup and rehearsal, budget 40–50 litres.
Three-phase supplies are common on larger events because they allow higher total capacity and cleaner distribution across production departments. We usually want the LED screen power planned as part of the whole production electrical design, not as a late add-on.
Use our rental LED screen requirements to estimate the screen size and power draw for your event — it gives you a starting figure to take to your generator supplier or venue technical manager.
Cable runs, distribution and safety
How you get the power from the distribution board to the LED screen matters as much as the supply itself.
Cable specification. For 32A supplies, 4mm² H07RN-F rubber cable is standard. For 63A, step up to 16mm². All cables on outdoor events should be rubber-sheathed to IP44 minimum — standard PVC extension leads are not rated for wet or muddy conditions.
Cable routing. Every cable crossing a public area needs a cable ramp or overhead gantry. This is not just tidy practice — it is a legal requirement under the Electricity at Work Regulations 1989 and event-specific guidance in BS 7909.
Distribution boards. For larger screens or multi-screen setups, a local distro board at the screen position makes cable management far simpler. We carry portable 63A-to-32A and 32A-to-16A distro boards on every rental job, pre-fitted with RCD protection and clearly labelled circuits.
Video control power. Compared with the LED screen itself, processors, laptops, media servers and switchers are a modest load. But video control power should be stable, accessible and protected from people unplugging it for phone chargers or catering equipment. We run Brompton Tessera processors on most rentals, with Novastar-based systems as backup. Where possible, we keep the LED screen power and control power on the same distro, then label everything clearly on site.
Backup and redundancy. For high-profile events — live broadcasts, award ceremonies, product launches — we bring a backup power path. That might be a second generator on automatic changeover, or a UPS unit that holds the screen for the 10–15 seconds a manual switchover takes.
All electrical work on temporary event installations in the UK should be carried out or signed off by a competent person under BS 7909. Our crew handle this as part of every rental LED panel installation, but if you are sourcing power separately, make sure your electrician is familiar with temporary event supply regulations — domestic or commercial electricians sometimes are not.
From the field
I regularly turn up to venues where the power situation is nothing like what was described on the phone. One that sticks with me was a Livery Hall awards dinner in central London where the venue swore they had 63A three-phase available at the event floor. When we arrived for load-in, the “63A supply” turned out to be a single 32A commando socket behind a locked cupboard on a different floor, with a lift too small to fit a cable drum. We made it work — I brought in a generator and parked it in the loading bay — but the client ended up paying for generator hire that a proper site survey would have flagged in advance. It is the same lesson on most jobs: the screen size and the LED video walls we rig are rarely the hard part, the supply behind them usually is. That is why I include a technical site visit on every hiring an LED screen over 10 m².
LED Screen Power Requirements: Frequently Asked Questions
How many amps does an LED screen need?
It depends on screen size and content. A 3m × 2m indoor screen on typical event content draws around 5–6 amps on a 230V supply. A 6m × 3m outdoor screen at full brightness can pull 20–25 amps. We calculate the specific requirement during the quoting process and confirm it against the venue’s available supply before the event.
Can I run an LED screen from a standard 13A plug socket?
Only very small screens — roughly 3–4 m² or below on indoor brightness. A single 13A socket delivers about 3 kW, and once you account for the processor and cabling losses, that leaves headroom for a small conference screen only. The circuit must not be assumed to be dedicated — we need to know what else is on it before confirming.
Do LED screens use more power outdoors?
Yes. Outdoor screens run at significantly higher brightness to remain visible in daylight — typically 5,000 to 7,000 nits compared with 1,000–1,500 nits indoors. Higher brightness means higher power draw. The same panel outdoors at full brightness can draw two to three times what it would indoors, which is why the power plan should always reflect the actual environment.
What happens if the power supply is not sufficient?
The screen’s built-in protection will either dim the output or shut panels down entirely. In the worst case, a tripped breaker takes the entire screen black mid-event. This is exactly why we verify power supply before confirming any screen hire — catching a shortfall in the planning stage is straightforward, catching it during a live event is not.
Do I need a separate circuit for the LED screen?
For screens above 10 m², a dedicated circuit is strongly recommended. Sharing a circuit with catering equipment, lighting, or PA systems risks tripping breakers when multiple loads spike simultaneously. Even on smaller screens, a dedicated circuit gives you clean, stable power and avoids interference from unrelated equipment.
Does pixel pitch affect power consumption?
A finer pixel pitch like P2.6 typically draws more power per square metre than a P3.9 or P4.8 panel because it packs more LEDs into the same area. But panel design, LED type, brightness, refresh settings and cabinet construction all matter too. Two panels with similar pitch can have different power characteristics. For planning, use the actual panel datasheet and screen area rather than pitch alone.
How much does it cost to power an LED screen for a full event day?
On venue mains, the electricity cost is minimal — a 4m × 3m screen running for 12 hours on average event content uses roughly 30–40 kWh, which at mid-2026 UK commercial rates (~35p/kWh) is under £15. The real cost consideration is generator hire if needed, which typically runs £300–£800 per day depending on the kVA rating. We can include generator hire in your rental package — get an estimate via the configurator.
Who is responsible for providing power at the venue?
This varies by venue. Purpose-built event spaces usually include power in the hire cost. Unusual venues, outdoor sites, and dry-hire spaces typically require you to arrange power separately. We confirm power responsibility during the quotation stage and can arrange generator hire as part of the package if needed.
Planning your event’s power supply
If the power plan is wrong, the screen goes black mid-event. Start with screen size, calculate peak draw, verify the venue supply, and plan your distribution route. If any of those steps throw up a question mark, resolve it before event day.
Our LED screen hire options gives you a quick estimate of screen size and power draw based on your venue dimensions and audience size. Get the LED screen power requirements right at the planning stage and event day looks after itself; for a full technical consultation including site survey and power planning, call us on +44 (0)203 489 9878 or get in touch here.
