According to the U.S Flag Code, American flags must be illuminated when flown at night.
Visibility is dependent on the relative positions of the luminaire, flag, and viewer, as well as on ambient light levels and contrast ratios with respect to other objects in the field of view. These rules of thumb should result in a satisfactory installation, regardless of the many variables involved:
Light levels shown below are average maintained footcandles from a single luminaire. For more specific project needs, please
consult our lighting experts.