As a point of reference, at .6 ft.lamberts, a square foot panel will produce enough light to illuminate a normal size bedroom to a point that it is easy to “get around in” without disturbing sleep. This light level is also adequate for items such as pathway markers and signs that are not in high light level areas or where automobile lights will directly hit. For sign applications in higher ambient light level areas a light output of at least 1 ft.lambert is recommended.