The brightness level for LED is important to consider if the LED display can be visible clearly under different environments. Such as it can be viewed and used under sunshine, outdoor, etc.
Basic guidance for brightness level for different application
Indoor Brightness: 800 – 1,500 nits
Outdoor Brightness : 2,000 – 3,000 nits
Outdoor Brightness Under direct sunlight: 4500-6000 nits
Outdoor brightness in desert climate under direct sunlight: 7000 -1200 nits