Nits, lumen and brightness
Luckily the sign industry has settled on a standard measurement that will help us to understand and compare different LED screens. This measurement is the nit, also known as candelas per square meter (c/m2). A nit is a unit of measurement for the total brightness over one square meter of an LED screen. This value takes into account all of the contributing factors to brightness, such as the number of LEDs per pixel, the pixel pitch and the brightness of individual LEDs. The nit is different than what is typically used for single light source such as projectors and flashlights, which are measured in lumens. The nit measurement assumes that all of the LEDs within the square meter are on at their full brightness as allowed by the screen software and hardware configuration. A special measurement device is used to deliver the nit rating of the screen. Outdoor LED screens can reach up to 10,000 nits or even higher. In comparison, an indoor LED screen range from 500 to 2500 nits.
If you plan to install your outdoor LED display in places that are shadowed, consider 1,000 – 2,500 nits to be enough for the brightness. For example it can be in a protected location, under an eave or somewhere where the screen would only face the morning sun.
If your installation location is in the bright outdoor places, consider 2,500 – 5,000 nits to be the target brightness, to ensure a clear and vivid images. Hence, if you’re planning to install your LED display somewhere facing west direction, then this would serve you with enough brightness.
Finally, when you pan to instll you LED display in the direct sunlight, you’ll need a display that has the brightness level of 5,000 – 10,000 nits, to make the content more visible.