Facade lighting

I do not understand if facade lighting is allowed and under what circumstances. When the requirement is "Light areas only as required for safety and comfort" this means to me that essentially only walkways and driveways may be lighted. One could argue that a facade lighting (lets say a wall washer) at low building levels would serve to light walkways, but is this really true? The BD+C reference guide shows lighting power allowances for facades but I think they just copied the table from ASHRAE addenda I and this does not necessarily mean all facade lighting is allowed for SSc8. Would a facade lighting at the top of a 15 storey building be allowed? It will not light anything else than the facade.