This may be a question strongly depending on application and opinion, but I'll give it a try.
I am designing some controls for an industrial application, including cap touch buttons and LED 7-segment displays. As I have many of those LED-segments (about 280) I won't be able to control them directly all the time, instead I will multiplex them.
The brightness of the led-segments will be indirectly proportional to the multiplex factor, I am wondering how bright a LED display "normally" should be, and if I can get away with my heavy multiplex design.
I am planning to use this, which has a typical brightness of 9.0 mcd. How deep can I multiplex this? could I get away with a 1:7 multiplexing (the brightness per segment will be 1/7th)?
If the above is not answerable: Is there anyone regularly working with displays? how is the brightness with those in general? The device I am building is only used inside. Sun-radiation directly onto the display is unlikely.