LED Screen Power Consumption and Running Costs in Pakistan

Two numbers appear on most LED screen datasheets: maximum power and average (typical) power. Many buyers plan with the wrong one.

Maximum power is a key input for your electrician when sizing cables, protection and backup. Average power is what drives your electricity consumption. Mix them up and you either under-size the electrical installation or misjudge your running costs.

This guide shows how to estimate both, how to work out monthly units (kWh), and practical ways to reduce consumption. The formulas here are for rough planning only; final electrical design must be done by a qualified electrician.

Maximum vs Average Power: The Key Difference

• Maximum power is what the screen draws showing full white at full brightness. It rarely happens with real content, but the electrical installation and any backup must be designed for it.
• Average power is the typical draw with normal content and settings. How it compares with maximum depends on the product, brightness setting and content, so use the manufacturer’s figure and, ideally, measure it on site.

For the basics of how SMD modules draw power, see our explainer on SMD screen power consumption. This article goes further, into consumption, backup and savings.

Where to Find Power Figures by Screen Type

Power per square metre varies widely between products, even at the same pitch. Use the datasheet of the exact model you are considering:

Outdoor screens generally draw more because they run at much higher brightness to be readable in sunlight. Our guide to outdoor SMD screen brightness in Lahore explains brightness needs and why screens should be dimmed at night.

The Consumption Formula

Step 1: Convert screen area to square metres. 1 m² = 10.764 sq ft.

Step 2: Daily units (kWh) = Area (m²) × Average power (W per m²) × Hours per day ÷ 1,000

Step 3: Monthly units = Daily units × Days in operation

To estimate cost, multiply monthly units by the per-unit rate shown on your own recent electricity bill. If your rate varies by time of day, apply each rate to the hours the screen runs in that period.

Worked Examples (Illustrative)

The average power figures below are assumed only to show the calculation. Replace them with your product’s datasheet figure or, better, a measurement on site.

The pattern is clear: small indoor screens use relatively little electricity, while large outdoor screens running long hours use a lot, so their running costs must be planned from the start. Purchase costs are covered separately in our SMD screen price in Pakistan guide.

For wedding halls, where screens run only a few hours per event, consumption is usually modest. See how halls use them in our SMD screens for Lahore wedding halls article.

Evening Hours

Outdoor screens are often busiest in the evening. Because brightness can usually be reduced after dark, evening consumption can be much lower than daytime consumption if automatic dimming is set up properly.

Sizing Cables, Protection and Phase Supply

Electrical design uses maximum power, not average, and must be carried out by a qualified electrician. As a rough first estimate only:

Single phase: Current (A) ≈ Max watts ÷ (supply voltage × power factor)

Three phase: Current per phase (A) ≈ Max watts ÷ (√3 × line voltage × power factor)

Use the power factor from the power supply datasheet. Your electrician must also account for inrush current when the screen switches on, cable length and voltage drop, ambient temperature and grouping derating, protective device selection, earthing, and the capacity of your connection. Whether single-phase or three-phase is appropriate depends on the load and your supply; large screens often need three-phase, balanced across the phases.

Surge protection, and voltage regulation where the supply is unstable, can help protect LED power supplies; your electrician can advise what the site needs. See also our page on SMD screen installation for businesses.

Backup Power: UPS, Inverter or Generator?

Power cuts create a choice: keep only the control system running, or the whole screen? All backup systems must be designed and installed by qualified electricians, with correct changeover arrangements.

Generator sizing: a common rough starting point is kVA ≈ peak kW ÷ power factor, plus headroom. Final sizing must consider inrush, other loads, altitude and temperature, and the generator manufacturer’s guidance, and should be done by a qualified electrician.

Can Solar Power an LED Screen?

Solar output depends on location, season, panel orientation and shading. Compare your screen’s daily units with an installer’s estimate of daily output for your site, and remember that evening and night operation needs batteries sized for that energy. For large outdoor screens that run at night, battery storage can be substantial. See powering digital signage with solar energy.

Seven Ways to Cut Running Costs

1. Automatic brightness control. A light sensor or schedule lowers brightness after dusk. For outdoor screens this is often one of the biggest savings; measure the effect on your own screen.
2. Scheduled on and off times. Few screens need full output in the early hours. Many controllers and media players support schedules; see our roundup of SMD screen software.
3. Smarter content. On LED screens, white and bright areas use the most power. Dark backgrounds with bright text use less and read well at night.
4. Common-cathode modules. These supply red, green and blue LEDs with different voltages instead of one shared voltage, which can reduce power and heat compared with common-anode designs. Check the manufacturer’s figures for the specific product.
5. Efficient power supplies. Check the efficiency figure on the power supply datasheet; inefficient supplies waste power as heat.
6. Right product, right brightness. Match brightness to the site’s light conditions. A shaded location may not need full outdoor brightness, but shade does not protect from rain: if the screen can get wet, it still needs a suitable outdoor IP rating.
7. Clean fans and filters. Clogged cooling makes components run hotter. Cleaning should follow the manufacturer’s instructions, with power isolated.

For advertisers running multi-site campaigns, our guide on energy efficiency in digital billboard campaigns covers scheduling across locations.

Whole-Life View: Electricity Over the Screen’s Life

When comparing screens, look at total cost over several years, not just the purchase cost:

For a large outdoor screen that runs long hours, electricity over several years can be a large share of the total, sometimes comparable to the purchase cost. That is why efficient components and good brightness control are worth considering.

Choosing Energy-Efficient Hardware at SMDLED

Our range includes the BIA Plus SMD screen module and BIA Ultra Thin SMD screen module. Brightness scheduling is a feature of the controller and software used with the modules, so confirm the full system specification with us. Browse our indoor SMD screens, or read how to plan cost-effective SMD screens for commercial advertising.

Businesses in Faisalabad can reach our team through the SMD screen provider in Faisalabad page.

Want a rough power estimate for your screen? Send your size, location and daily hours through our contact page and we can share the product’s power figures and an estimate of monthly units for your electrician to use.

Frequently Asked Questions

How many units does an LED screen use per day?

Multiply area in m² by average watts per m² and hours, then divide by 1,000. Use the datasheet’s average power figure or a measurement on site.

Why is my LED screen’s consumption higher than expected?

Common causes are full brightness at night, white-heavy content, no scheduling, and clogged cooling.

Can an LED screen run on a UPS?

Small indoor screens can, if the UPS is sized for the load. For outdoor screens, a UPS is often used only for the control system, with a generator for the full display. A qualified electrician should design the system.

Does a higher pixel pitch use less power?

Not necessarily. Brightness, LED efficiency and the driving design often matter more than pitch. A bright outdoor screen typically uses much more power per square metre than an indoor screen.