I see there is stated illuminance limits for 'Internally Illuminated Exterior Signage' but there is also an exemption stated for 'internally illuminated signage' and this is causing some confusion. I'm hoping someone can confirm on the interpretation of the exemption for internally illuminated signage.

Does the exemption only apply to an internally illuminated sign that is physically located inside the shell of the building (i.e. located on the inside of a building next to a window)? Or does it also include a sign that is mounted on an exterior wall or hanging on the outside on a window? In either case the signage would be located approximately in the same location for visual puposes, one being outside the glass, one being inside the glass. 

Does that glass in this case count as the boundary between being an exemption or not?