Garage lighting

I don't see "building-mounted" defined anywhere. I think of it as façade mounted. "Building-mounted luminaires with the backlight oriented toward the building are exempt from the backlight rating requirement." Lights in an entrance canopy typically don't worry about backlight ratings so it sounds like anything building mounted as long as one side is towards your own building. Now, by garage, I'm assuming parking garage with open sides. I'd call the lights inside of the garage as building mounted and anything on the top (open) level as similar to any parking lot light. It just makes the most sense that way. By site boundary, do you mean LEED project boundary, or SSc6 lighting boundary? If the garage is inside of the project boundary, then the lights need to be shown to be compliant. If the garage is inside of the lighting boundary, but outside of the project boundary, you don't need to worry about the lights when documenting this credit.