You'll want to consult with a sign professional, but here are a few items to consider:
Display size
• What will be the typical viewing distance?
• Will your LED sign fit into an existing sign?
• What is your need for detail in the images you will display (pixel pitch)?
In general, the smaller pixels create a more vivid experience when viewers are closer to your sign. Larger pixels work well when viewing from a long distance, such as from the highway.
Color or monochrome?
• Will the products or services you want to advertise work best in color?
• What is the environment of your sign?
• How will color or monochrome stand out?