WAter fountain in buildings - exterior lumen ligthing

Good morning, I wonder how i should account a WAter fountain in the exterior of my building. It is like this one: http://www.hidroworks.com/galeria.php?id=2 . The are lamps in the base of the water fountain, so a level zero can be saw the luminosity, Should I account the lumes of this exterior ligthing in the Lamp Lumen Calculation (Table SSc8-4. Site Lumen Calculation)? or should i use a smaller value due to brigthess loos? or should i not account this lamp due to the fact that this ligthing system is an exterior ligthing system independent of the exterior ligthins system of the building? Thank you