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LED brightness and nits: how bright is bright enough?
5 min read · Updated October 2026
Indoor LED displays typically need around 600–1,200 nits, control rooms deliberately sit at the lower end around 600, and outdoor screens in daylight need 5,000–8,000 nits or more. A screen behind shop glass facing a sunny street should be treated as outdoor. More brightness is not automatically better: the right figure is the one that stays readable in the brightest conditions the screen will face, combined with automatic dimming for everything else.
What is a nit?
A nit is a unit of luminance equal to one candela per square metre — in plain terms, how much light the screen surface emits towards the viewer. Displays are compared in nits because it is independent of screen size.
For reference, a typical office laptop or LCD signage panel runs at a few hundred nits, while an outdoor LED billboard runs many times brighter to compete with sunlight. The number on a datasheet is usually the maximum; the screen will often run well below it in practice.
How bright should an indoor LED screen be?
Most indoor screens are comfortable at around 600–1,200 nits. Lobbies, retail interiors and atria with large windows sit towards the top of that range; boardrooms and auditoriums with controlled lighting sit lower.
Control rooms are the clearest case for less. Operators look at the wall for hours, often in dim rooms, and excessive brightness causes fatigue and makes fine detail harder to read. The P1.5 COB control room we installed in Kathmandu — Nepal’s first COB LED installation — runs at 600 nits for exactly that kind of environment. Even a 600-nit screen is usually dimmed further during operation.
How bright should an outdoor LED screen be?
Outdoor screens in direct daylight typically need 5,000–8,000 nits or more, depending on which way they face and how much direct sun falls on them. A screen in shade or facing north needs less; one facing south or west into afternoon sun needs the top of the range.
Two of our outdoor installations show the typical band: the P5 screen at the National Soil Science Research Centre in Lalitpur runs at 6,000 nits, and the P6 information screen for Tokha Municipality Ward No. 5 at 5,500 nits. Both are IP65 front and rear. Our indoor versus outdoor guide covers the other differences that come with an outdoor build.
Why does a shopfront screen need outdoor brightness?
Because it competes with daylight even though it is indoors. A screen behind glass facing a sunny street has to overcome the light on the street and the reflections on the glass, and an indoor-brightness screen will look washed out for most of the day.
This is the most common brightness mistake in Nepali retail. The fix is to specify the screen as an outdoor-brightness product, usually without needing full outdoor weather sealing, and to keep the glass clean and as non-reflective as possible. Ventilation matters too, because a bright screen behind glass in the sun generates heat that needs somewhere to go.
Is it possible to be too bright?
Yes. An indoor screen running too bright is tiring to watch and makes skin tones and white backgrounds look harsh. An outdoor screen at full daytime brightness after dark causes glare, annoys neighbours, can distract drivers, and wastes electricity.
Over-specification has other costs. Higher brightness means more power, more heat and faster ageing of the LEDs. Running a screen far below its capability also reduces the number of grey levels it can show, so dark scenes and gradients can look stepped. The aim is enough headroom for the brightest conditions, not the highest number available.
How does auto-dimming work, and do you need it?
Auto-dimming uses an ambient light sensor, a schedule, or both, to lower brightness when conditions allow. On an outdoor screen, the sensor raises brightness in bright sun and lowers it at dusk and at night; on an indoor screen, a schedule usually suffices.
For any outdoor screen in Nepal, automatic dimming is worth treating as essential. It keeps the screen readable at noon, comfortable at night, reduces power consumption and extends LED life. When you request a quote, give us the direction the screen will face and the hours it will run, and we will specify brightness and dimming to suit the site rather than the brochure.
The short version
- A nit is one candela per square metre — the brightness of the screen surface.
- Indoor LED screens typically need about 600–1,200 nits; control rooms around 600.
- Outdoor screens in daylight need about 5,000–8,000 nits or more, depending on orientation.
- A screen behind glass facing a sunny street should be specified with outdoor brightness.
- Too much brightness wastes power, causes glare and ages LEDs faster.
- Automatic dimming is essential for outdoor screens in Nepal.
Common questions
How many nits does an outdoor LED screen need in Nepal?
Typically 5,000–8,000 nits or more for a screen in direct daylight. South- and west-facing screens that take strong afternoon sun need the top of the range, while shaded or north-facing screens need less. An ambient light sensor should dim it at night.
How bright should an indoor LED wall be?
Around 600–1,200 nits suits most indoor walls. Bright lobbies and atria with large windows sit towards the top; boardrooms and auditoriums with controlled lighting sit lower. Control rooms are usually set around 600 nits or below.
Why does my LED screen look washed out behind the shop window?
It is probably an indoor-brightness screen competing with daylight and reflections on the glass. Screens facing out through glass need outdoor-level brightness. Reducing reflections and shading the glass can help, but the lasting fix is a brighter screen.
Is a brighter LED screen always better?
No. Excess brightness causes eye strain indoors and glare outdoors, uses more electricity and ages the LEDs faster. Choose enough brightness for the brightest conditions the screen will face, then let automatic dimming lower it the rest of the time.
What is the difference between nits and lumens?
Nits measure the brightness of a surface, such as an LED screen, in candela per square metre. Lumens measure the total light output of a source, such as a projector. LED displays are specified in nits.
Where to go next
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