How many nits do I actually need on a monitor?

For a dark or dim room, 200 to 300 nits is plenty. For a moderately bright room, 300 to 500 nits covers most daytime use. Near a window or in a very bright office, 500 to 1000 nits avoids squinting. Outdoors you need 1000 nits or more to compete with sunlight.

How many nits does normal SDR content use?

Standard Dynamic Range content tops out at roughly 100 to 250 nits and covers the sRGB color space. That is why a 250 nit monitor is perfectly adequate for documents, browsing and most games.

Is 400 nits enough for HDR?

It is marginal. HDR highlights look best from 600 nits peak upward. A 400 nit display can still show HDR if the tone mapping is good, but the effect is limited and often looks flatter than a well tuned SDR mode.

What is the difference between typical and peak brightness?

Typical or sustained brightness is what the monitor can hold indefinitely, and it is what affects everyday use. Peak brightness is a brief burst over a small area, often measured across 1 to 10 percent of the screen for under a second. A monitor sold as 1000 nits HDR may sustain only 400 nits.

What do the DisplayHDR numbers mean in nits?

DisplayHDR 400 requires 400 nits typical. DisplayHDR 600 requires 600 nits minimum peak over a 10 percent window. DisplayHDR 1000 requires 1000 nits minimum peak. DisplayHDR True Black is OLED specific and prioritizes near zero black levels over peak brightness.

What Is Nits? Monitor Brightness Explained Simply

The simple version first

One nit equals one candela per square meter. A candela is roughly the brightness of a single candle at one meter distance. So a 400 nit monitor puts out roughly the light of 400 candles per square meter of screen area.

The term "nit" is informal but universally used in consumer display specs. The formal unit is cd/m2.

Reference points

To put numbers in context:

Typical laptop screen: 250-350 nits

Budget monitor: 250 nits

Mid-range monitor: 300-400 nits

Bright outdoor monitor: 600-1000 nits

DisplayHDR 600 monitor: 600 nits peak

DisplayHDR 1000 monitor: 1000 nits peak

OLED TV: 500-900 nits typical, 1000-2000 nits peak

iPhone 15 Pro outdoor mode: 2000 nits

Direct sunlight: about 1 billion nits

How many nits do you actually need

For a dark or dim room: 200-300 nits is plenty. Using a 1000 nit monitor at full brightness in a dark room is uncomfortable and strains your eyes.

For a moderately bright room: 300-500 nits covers most daytime use.

For a very bright office or near a window: 500-1000 nits gives comfortable visibility without squinting.

For outdoor use: 1000+ nits becomes necessary when competing with sunlight.

For HDR content: peak brightness matters more than sustained brightness. HDR highlights look best with 600+ nit peaks, but a 400 nit monitor can still show HDR if the display software does good tone mapping.

Why HDR brightness specs can mislead

Monitor manufacturers specify two types of brightness:

Typical (sustained) brightness: The maximum brightness the monitor can hold indefinitely. This is what affects everyday use.

Peak (burst) brightness: The maximum brightness the monitor can achieve briefly in a small area. Often measured over 1-10% of the screen area for less than a second.

A monitor marketed as "1000 nits HDR" might have a typical brightness of 400 nits and only achieve 1000 nits for a brief flash over a small highlight area. This is real, but the 1000 nit number overstates what you will see in practice.

VESA DisplayHDR certifications define minimum requirements for different tiers:

DisplayHDR 400: 400 nits typical, basic HDR

DisplayHDR 600: 600 nits minimum peak over 10% window, better HDR

DisplayHDR 1000: 1000 nits minimum peak, true HDR quality

DisplayHDR True Black: OLED-specific, focuses on near-zero black rather than peak brightness

Using brightness correctly day to day

Your monitor brightness should be set to match your room. A bright monitor in a dark room causes eye strain just as reading a book in a dim room does. Your eyes adapt to the background ambient light and the screen should match.

A simple test: look at a white area of the screen and then at a white piece of paper in the room. If the screen looks much brighter than the paper, turn brightness down. If much dimmer, turn it up.

Our Brightness Test tool shows a range of gray steps, near-black and near-white patterns. At your calibrated brightness, you should be able to distinguish all 16 gray steps. If the darkest steps merge into black, the brightness is too low.