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Hi,
I have a questions about how to the distance to the project boundary and mounting height is considered for lighting fixtures mounted on a roof terrace. Is the distance to the project boundary measured in plan , and then the mounting height from the ground level. Meaning that a wall fixture/marker mounted at 0.5 above the floor of the roof terrace will have a mounting height of 19.5mt if the terrace floor is 19mt above the ground? Or how should it be taken into account?
Thanks in advance,
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There is no clear direction on this in the reference manual. You'll need to apply some common sense when laying this out. I'm using pole height to describe the height of the fixture above the roof terrace. And building height is the height of the roof terrace above grade.
As an example. If there is a parking garage with a pole mounted fixture on the top level. It is mounted at the edge of the building on one of the column tops. I would consider the rear of the backlight portion of the light to have a mounting height of the building + pole. But the front (glare) portion of the light that shines onto the roof deck to have a mounting height of just the pole.
Or think of it another way. If the lighting zone allows this fixture to be 0.5MT away from the edge of the lighting boundary, and the 0.5MT (pole only) portion lands fully within the roof area, I would only count the pole height. If part of the allowed 0.5MT (pole only) circle falls off of the roof area, on the side of the building it falls off I would use building + pole height.
If that doesn't make sense I'll try to add a sketch.