Brightness is the single number buyers ask about first, and the single number most often chosen badly. Too low and the screen disappears in daylight. Too high and you pay for power, heat and shorter component life that nobody needed.
The short answer
For a screen in direct sunlight, plan on 5,000 nits minimum and 6,000 nits if the face is in the sun for most of the day. Under a canopy, in a shaded street or facing away from the sun, 3,500 to 4,500 nits is enough. Indoors, anything above 1,000 nits is wasted.
What a nit actually measures
A nit is one candela per square metre (cd/m²). It describes how much light the screen emits from each square metre of surface, measured straight on. It says nothing about contrast, colour accuracy or viewing angle — which is why a screen with a big nits number can still look worse than a dimmer one.
Sunlight at midday is roughly 100,000 lux on a horizontal surface. An emissive display cannot match that, and it does not need to. What it needs is enough output to stay clearly brighter than the light reflecting off its own surface.
The numbers by viewing condition
| Viewing condition | Typical minimum | Recommended |
|---|---|---|
| Indoor meeting room, controlled light | 300 nits | 600–800 nits |
| Shop window, shaded or north facing | 1,000 nits | 2,000–3,000 nits |
| Outdoor under canopy or deep shade | 2,500 nits | 3,500–4,500 nits |
| Outdoor, indirect sun on the face | 4,000 nits | 5,000–5,500 nits |
| Outdoor, direct sun on the face all day | 5,000 nits | 6,000–6,500 nits |
These figures assume the audience is looking at the screen from a normal distance, not from a low angle where reflections from the sun dominate. If the screen sits above a bright road surface, add roughly 10 percent.
Why 5,000 nits, and not 2,000
The practical test is not whether the image is visible, but whether it is readable. Black areas on an LED screen are never truly black in daylight — the surface reflects ambient light, and that reflection raises the floor of the image. Once the reflected light approaches the screen’s own output, contrast collapses and the picture looks grey regardless of how saturated the content is.
At 5,000 nits, a well-designed outdoor cabinet keeps enough separation between the lit pixels and the reflected background to hold contrast in direct sun. At 2,000 nits the same screen is fine at dusk and unreadable at noon.
Why brighter is not always better
Brightness is bought with current. Doubling output does not double power draw, but it does raise it substantially, and every extra watt becomes heat inside a sealed cabinet.
- Power provisioning. A 6,000-nit wall can pull two to three times the current of a 2,500-nit wall at full output. That affects cable sizing, breaker count and sometimes the service you have to order from the utility.
- Heat and lifespan. LED packages and driver ICs age faster at higher junction temperature. Running at maximum output around the clock is the fastest way to shorten the life of a screen that would otherwise last a decade.
- Light pollution and complaints. A 6,000-nit screen running at full output at 2 a.m. is a nuisance and, in many cities, a regulatory problem. Advertising screens near housing are frequently required to dim after a set hour.
- Eye comfort at close range. Brightness that is correct for a billboard viewed from 20 m is painful on a screen viewed from 3 m.
Nits and contrast are not the same thing
A screen rated at 6,000 nits can still look washed out if its black level is poor. Two things drive outdoor black level: the LED package (black-bodied SMD parts reflect less than white-bodied ones) and the mask and louvre design around the modules.
This is why two cabinets with identical nits can look very different side by side, and why judging a screen from a specification sheet alone is risky. If the screen will compete with direct sun, ask for the contrast ratio measured in daylight conditions, not in a dark room.
Auto brightness: the setting most screens never use
Nearly every outdoor controller supports brightness scheduling and an ambient light sensor. Set a daytime curve at full output and a night curve at 15 to 25 percent. The screen still looks correct to the viewer, because the human eye adapts to ambient light, and power consumption drops by more than half over a 24-hour cycle.
Scheduling also extends component life and removes most neighbour complaints before they start. It is the cheapest upgrade available on an outdoor installation.
Common mistakes
- Judging brightness in a showroom. A 3,000-nit screen looks blinding indoors and weak in direct sun. Always ask for an outdoor demonstration or a daylight photo of the same model.
- Buying maximum nits for a shaded position, then paying for the power forever.
- Forgetting that the front face is not the only surface. IP65 on the front and a lower rating on the rear is normal, but rear access still needs weather protection.
- Ignoring viewing angle. At 140 degrees the image holds up well off-axis; a narrow-angle cabinet will look dim to anyone standing to the side of a wide wall.
- Forgetting the controller. A very bright wall with a controller that cannot drive the pixel count at the required frame rate will still look wrong.
Frequently asked questions
Is 5,000 nits enough for a billboard facing the sun?
For most of the day, yes. If the face points south in a sunny climate and stays lit from morning to evening, specify 6,000 nits and use the brightness schedule to recover the power at night.
Can an outdoor screen be dimmed at night?
Yes, and it should be. Controller-based scheduling is standard. Some municipalities require it.
Do transparent LED screens have lower brightness?
Usually, because the mesh structure removes emitting area. Expect 3,000 to 5,500 nits depending on the transparency percentage. A 60 percent transparent screen will always be dimmer than a solid one of the same generation.
Does higher brightness shorten the life of the screen?
Continuous maximum output does accelerate ageing. The effect is small if the screen runs a day and night curve, and significant if it runs at 100 percent permanently.
Send us the position, we will confirm the nits
Three details decide it: which way the screen faces, whether anything shades it, and how far the audience stands. Send those and we will confirm the brightness, the cabinet and the power budget for your site.
Typical outdoor builds use the EA1000F2 outdoor advertising LED screen at 4,500–6,000 nits, the EA-OFixed outdoor fixed advertising board for permanent installation, or the EA1000TOF2 outdoor transparent LED screen where the façade has to stay see-through. Send your brief through the contact page.