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Spacing Height Ratio is defined as the ratio of the distance between adjacent luminaires (centre to centre), to their height above the working plane.
If you know SHR and the height, the distance apart D is pretty straight forward. You then need to check absolute limits such as SHR (Transverse), SHR (axial) and SHR Max.
You can also use the following as a quick means check:
SHR(Nominal) = (1/Hm) x (Square root(Area/N))
Where Hm is mounting height, N is number of luminaires.
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